EP3765511A1 - Anticorps anti-cd25 pour la déplétion de cellules spécifiques d'une tumeur - Google Patents
Anticorps anti-cd25 pour la déplétion de cellules spécifiques d'une tumeurInfo
- Publication number
- EP3765511A1 EP3765511A1 EP19711315.2A EP19711315A EP3765511A1 EP 3765511 A1 EP3765511 A1 EP 3765511A1 EP 19711315 A EP19711315 A EP 19711315A EP 3765511 A1 EP3765511 A1 EP 3765511A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antibody
- antigen
- binding fragment
- seq
- amino acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Definitions
- the present invention relates to anti-CD25 antibodies, pharmaceutical
- compositions comprising anti-CD25 antibodies and therapeutic uses of such antibodies.
- Cancer immunotherapy involves the use of a subject’s own immune system to treat or prevent cancer.
- Immunotherapies exploit the fact that cancer cells often have subtly different molecules on their surface that can be detected by the immune system. These molecules, or cancer antigens, are most commonly proteins, but also include molecules such as carbohydrates. Immunotherapy thus involves provocation of the immune system into attacking tumour cells via these target antigens.
- malignant tumours in particular solid tumours, can escape immune surveillance by means of various mechanisms both intrinsic to the tumour cell and mediated by components of the tumour microenvironment.
- tumour infiltration by regulatory T cells (Treg cells or T regs) and, more specifically, an unfavourable balance of effector T cells (T eff) versus Tregs (i.e. a low ratio of Teff to Treg) have been proposed as critical factors (Smyth M et alvisor 2014).
- Tregs have been found to be critical in mediating immune homeostasis and promoting the establishment and maintenance of peripheral tolerance.
- their role is more complex.
- cancer cells express both self- and tumour-associated antigens, the presence of Tregs, which seek to dampen effector cell responses, can contribute to tumour progression.
- the infiltration of Tregs in established tumours therefore represents one of the main obstacles to effective anti- tumour responses and to treatment of cancers in general.
- Suppression mechanisms employed by Tregs are thought to contribute significantly to the limitation or even failure of current therapies, in particular immunotherapies that rely on induction or potentiation of anti-tumour responses (Onishi H et al; 2012).
- CD25 is one of the potential molecular targets for achieving depletion of Tregs.
- CD25 also known as the interleukin-2 high-affinity receptor alpha chain (IL-2Ra)
- IL-2Ra interleukin-2 high-affinity receptor alpha chain
- the IL- 2/CD25 interaction has been the object of several studies in murine models, most of them involving the use of PC61 , a rat anti-murine CD25 antibody (Setiady Y et al., 2010.).
- anti-CD25 antibodies still allow the binding of IL-2 to CD25, such as the clone 7D4 (anti-mouse CD25), clone 2E4 (anti-mouse CD25), clone MA251 (anti- human CD25) or 7G7B6 (anti-human CD25) (i.e. non-blocking antibodies).
- 7D4 is a rat IgM anti-mouse CD25 antibody that has been extensively used to detect CD25-positive cells in the presence of or following the treatment with PC61 or of antibodies having similar binding properties (Onizuka S et al., 1999).
- CD25 has been identified as a Treg marker and could thus be an interesting target for therapeutic antibodies aiming at depleting Treg.
- CD25 is the alpha subunit of the receptor for IL-2 and IL-2 is a key cytokine for Teff responses.
- Anti-CD25 antibodies that have undergone clinical testing so far whilst depleting Treg cells also block IL-2 signalling via CD25 (specifically a CD25/CD 122/CD 132 complex).
- the present inventors have now found that such a blockade of IL-2 signalling limits Teff responses and that an anti-CD25 antibody that does not block the IL2 signalling can effectively deplete Treg cells, whilst still allowing IL-2 to stimulate Teff cells, providing antibodies that exhibit a strong anti-cancer effect.
- the present invention provides new anti-CD25 Antibody Agents.
- the anti-CD25 Antibody Agents are antibodies or antigen-binding fragments or variants thereof that specifically bind to CD25, particularly to human CD25, without blocking the binding of interleukin 2 (IL-2) to CD25, or signaling of IL-2 via CD25, and which deplete efficiently Tregs, in particular within tumours.
- IL-2 interleukin 2
- the anti-CD25 antibodies or antigen-binding fragments or variants thereof bind CD25 without blocking the binding of IL- 2 to CD25 or signalling of IL-2 via CD25.
- the anti-CD25 antibodies inhibit less than 50% of IL-2 signalling compared to IL-2 signalling in the absence of the antibodies, or alternatively stated as the anti-CD25 antibodies allow at least 50% of IL-2 signaling in response to IL-2 binding to CD25 compared to the level of signaling in the absence of the anti-CD25 antibody.
- the anti-CD25 antibodies are therefore referred to as non-blocking or non-IL-2 blocking anti- CD25 antibodies.
- anti-CD25 antibodies that do not block IL-2 binding or signalling via CD25 and deplete Tregs have strong anti-tumour effects in particular have a stronger anti-tumour effect than anti-CD25 antibodies that deplete Treg but block IL-2 signalling.
- the antibodies increased the CD4+Teff/Treg and CD8+Teff/Treg ratios.
- the effective depletion of tumour-infiltrating Treg cells whilst preserving IL-2 signalling on Teff cells leads to a therapeutic approach for use in treating cancer alone or in combination with other anti-cancer agents.
- the provided anti-CD25 Antibody Agents are characterized by one or more features that are associated with binding to a specific epitope in human CD25 extracellular domain, and/or that render them particularly amenable to
- the provided technologies including the provided anti-CD25 Antibody Agents (e.g., the provided antibodies or antigen-binding fragments or variants thereof), compositions including them, and/or uses for them, are useful in medicine. In some embodiments, such provided technologies are useful in cancer therapy and/or
- the provided anti-CD25 Antibody Agents are exemplified by the antibodies comprising the sequences of SEQ ID NO: 1 and 3, the sequences of SEQ ID NO: 1 and 4, the sequences of SEQ ID NO: 2 and 3 or the sequences of SEQ ID NO: 2 and 4, also referred to herein as Antibody 1 , Antibody 2, Antibody 3 and Antibody 4, respectively.
- References to anti-CD25 Antibody Agents herein, such as Antibody 1 , Antibody 2, Antibody 3 and Antibody 4 includes fragments and variants thereof, including affinity matured variants.
- an Anti-CD25 Antibody Agent comprising a variable heavy chain region comprising an amino acid sequence having at least 95% sequence identity to SEQ ID NO:1 and/or a variable light chain region comprising an amino acid sequence having at least 95% sequence identity to SEQ ID NO:3.
- an amino acid sequence having at least 95% sequence identity to SEQ ID NO:1 comprises the sequence of SEQ ID NO:1 or SEQ ID NO:2.
- an amino acid sequence having at least 95% sequence identity to SEQ ID NO:3 as the light chain variable region comprises the sequence of SEQ ID NO:3 or SEQ ID NO:4.
- an anti-CD25 Antibody Agent comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 1 and/or a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3.
- an anti-CD25 Antibody Agent comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 1 and/or a variable light chain region comprising the amino acid sequence of SEQ ID NO: 4.
- an anti-CD25 Antibody Agent comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 2 and/or a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3.
- an anti-CD25 Antibody Agent comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 2 and/or a variable light chain region comprising the amino acid sequence of SEQ ID NO: 4.
- the provided antibodies or antigen-binding fragments and variants thereof bind to human CD25 with a Kd in the range of 10 7 M or below (e.g. in the 10 8 or 10 9 or 10 1 ° or 10 11 or 10 12 or 10 13 range or below).
- the provided anti-CD25 Antibody Agents e.g. the provided antibodies or antigen-binding fragments thereof, including variants and derivatives thereof, such as affinity matured variants
- the provided anti-CD25 Antibody Agent (e.g., the provided antibodies or antigen- binding fragments and variants thereof) bind to human CD25 extracellular domain.
- the provided anti-CD25 Antibody Agents may bind to an epitope of CD25 (e.g., when assessed using one or more assays as described herein or otherwise known in the art), in particular the ones identified as aCD25ep-a and aCD25ep-b.
- provided antibodies or antigen-binding fragments or variants thereof may bind to human and non-human primate (for example Cynomolgus Monkey) CD25 (e.g., to an extracellular epitope on human and/or Cynomolgus Monkey CD25) with a Kd value in the 10 7 M range or below, for example in the 10 8 or 10 9 or 10 1 ° or 10 11 or 10 12 or 10 13 range or below.
- the provided anti-CD25 Antibody Agents e.g. the provided antibodies or antigen-binding fragments thereof, including variants and derivatives thereof, such as affinity matured variants
- the present disclosure provides a procedure that can be utilized to identify and/or characterize particularly useful anti-CD25 Antibody Agents (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof) as described herein (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof characterized by certain structural and/or functional features, such as specific binding to human CD25 (e.g., to an extracellular epitope thereof), impact on IL-2 signalling activity as described herein, cytotoxic activity as described herein (e.g., with respect to CD25- positive cells such as immune regulatory cells or CD25 expressing cancer cells), and combinations thereof).
- anti-CD25 antibodies or antigen-binding fragments or variants thereof as described herein (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof characterized by certain structural and/or functional features, such as specific binding to human CD25 (e.g., to an extracellular epitope thereof), impact on IL-2 signalling activity as
- particularly useful anti-CD25 antibodies as described herein are characterized by a plurality of such features.
- one or more antibodies described herein may be characterized as anti-CD25 Antibody Agents.
- certain antibodies and/or antigen-binding fragments comprising sequences of the antibodies herein described are characterized by such desirable structural and/or functional features; such antibodies and/or antigen-binding fragments or variants thereof may be referred to herein as anti-CD25 Antibody Agents.
- Antibodies (and/or antigen-binding fragments or variants thereof) described herein may be particularly useful in medicine (e.g., in therapy and/or in prophylaxis, for example in the treatment of cancer), and/or for use with respect to methods that require or involve targeting an epitope such as the one identified as aCD25ep-a (protein sequence
- the provided antibodies or antigen-binding fragments or variants thereof may be prepared as presenting the most appropriate isotype, in particular human isotype from the group consisting of lgG1 , lgG2, lgG3, and lgG4 isotype antibodies, more particularly human lgG1 or human lgG2, preferably human lgG1.
- the present invention provides antibodies or antigen-binding fragments or variants thereof comprising a variable heavy chain comprising an amino acid sequence having at least 95% sequence identity to SEQ ID NO:1.
- the amino acid sequence has at least 96%, 97%, 98% or 99% sequence identity to SEQ ID NO:1.
- variable heavy chain comprises the amino acid sequence of SEQ ID NO:1 or the amino acid sequence of SEQ ID NO:2.
- the antibody or antigen-binding fragment thereof may further comprise a variable light chain comprising an amino acid sequence having at least 95% sequence identity to SEQ ID NO:3.
- the amino acid sequence has at least 96%, 97%, 98% or 99% sequence identity to SEQ ID NO:3.
- the present invention provides, antibodies or antigen-binding fragments thereof comprising a variable light chain comprising an amino acid sequence having at least 95% sequence identity to SEQ ID NO:3.
- amino acid sequence has at least 96%, 97%, 98% or 99% sequence identity to SEQ ID NO:3.
- variable light chain can comprise the amino acid sequence of SEQ ID NO:3 or the amino acid sequence of SEQ ID NO:4.
- the antibody or antigen binding fragment is selected from the group consisting of:
- an antibody or antigen binding fragment that comprises a variable heavy chain region comprising the amino acid sequence of SEQ ID NO:1 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3;
- an antibody or antigen binding fragment that comprises a variable heavy chain region comprising the amino acid sequence of SEQ ID NO:1 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 4;
- an antibody or antigen binding fragment that comprises a variable heavy chain region comprising the amino acid sequence of SEQ ID NO:2 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3;
- an antibody or antigen binding fragment that comprises a variable heavy chain comprising the amino acid sequence of SEQ ID NO:2 and a variable light chain comprising the amino acid sequence of SEQ ID NO: 4.
- the amino acid sequences of the antibodies of the invention may comprise a number of amino acid substitutions with respect to the amino acid sequence provided in the SEQ ID NOs.
- such sequence may comprise, as a variable heavy chain region, a sequence containing up to 1 , up to 2, up to 3, up to 4, or more amino acid substitutions within SEQ ID NO:1 or SEQ ID NO:2 and/or as a variable light chain region a sequence containing up to 1 , up to 2, up to 3, up to 4, or more amino acid substitutions within SEQ ID NO:3 or SEQ ID NO:4.
- the antibodies presenting such amino acid sequence elements and such substitutions can still present the binding and/or functional properties of the antibodies of the invention, and of anti-CD25 Antibody Agents in general.
- the present invention provides an anti-CD25 Antibody Agent (i.e. an antibody or antigen-binding fragment thereof) comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 1 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3, wherein the antibody or antigen-binding fragment thereof has up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 1 and up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 3.
- an anti-CD25 Antibody Agent i.e. an antibody or antigen-binding fragment thereof
- an antibody or antigen-binding fragment thereof comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 1 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 4, wherein the antibody or antigen-binding fragment thereof has up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 1 and up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 4.
- an anti-CD25 Antibody Agent i.e.
- an antibody or antigen-binding fragment thereof comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 2 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 3, wherein the antibody or antigen-binding fragment thereof has up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 2 and up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 3.
- an anti-CD25 Antibody Agent i.e.
- an antibody or antigen-binding fragment thereof comprising a variable heavy chain region comprising the amino acid sequence of SEQ ID NO: 2 and a variable light chain region comprising the amino acid sequence of SEQ ID NO: 4, wherein the antibody or antigen-binding fragment thereof has up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 2 and up to 5 amino acid substitutions compared to the sequence of SEQ ID NO: 4.
- the present invention provides an anti-CD25 Antibody Agent (i.e. an antibody or antigen-binding fragment thereof) comprising: a. i) a variable heavy chain region sequence comprising the amino acid sequence of SEQ ID NO: 1 (or a variant thereof, such as an affinity matured variant thereof) or a variable heavy chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 1 (or a variant thereof, such as an affinity matured variant thereof); and/or ii) a variable light chain region sequence comprising the amino acid sequence of SEQ ID NO: 3 (or a variant thereof, such as an affinity matured variant thereof) or a variable light chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 3 (or a variant thereof, such as an affinity matured variant thereof); or b.
- variable heavy chain region sequence comprising the amino acid sequence of SEQ ID NO: 1 (or a variant thereof, such as an affinity matured variant thereof) or a variable heavy chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 1 (or a variant thereof, such as an affinity matured variant thereof); and/or ii) a variable light chain region sequence comprising the amino acid sequence of SEQ ID NO: 4 (or a variant thereof, such as an affinity matured variant thereof) or a variable light chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 4 (or a variant thereof, such as an affinity matured variant thereof).
- variable heavy chain region sequence comprising the amino acid sequence of SEQ ID NO: 2 (or a variant thereof, such as an affinity matured variant thereof) or a variable heavy chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 2 (or a variant thereof, such as an affinity matured variant thereof); and/or ii) a variable light chain region sequence comprising the amino acid sequence of SEQ ID NO: 3 (or a variant thereof, such as an affinity matured variant thereof) or a variable light chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 3 (or a variant thereof, such as an affinity matured variant thereof); or d.
- variable heavy chain region sequence comprising the amino acid sequence of SEQ ID NO: 2 (or a variant thereof, such as an affinity matured variant thereof) or a variable heavy chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 2 (or a variant thereof, such as an affinity matured variant thereof); and/or ii) a variable light chain region sequence comprising the amino acid sequence of SEQ ID NO: 4 (or a variant thereof, such as an affinity matured variant thereof) or a variable light chain region sequence having at least 95%, at least 96%, at least 97%, at least 98% or at least 99% sequence identity to the amino acid sequence of SEQ ID NO: 4 (or a variant thereof, such as an affinity matured variant thereof).
- the invention also provides variant antibodies or antigen-binding fragments or variants thereof of the antibodies described herein.
- the invention provides antibodies or antigen-binding fragments or variants thereof wherein any DG motif in the light or heavy chains of the antibodies may be altered, for example to reduce aspartate isomerization and/or wherein any NG motif in the light or heavy chains of the antibodies may be altered, for example to reduce asparagine deamidation and/or wherein any methionine in the light or heavy chains of the antibodies may be altered, for example to reduce methionine oxidation.
- a DG motif may be altered to substitute one or both of the amino acids in the motif with a different amino acid.
- An NG motif may be altered to substitute one or both of the amino acids in the motif with a different amino acid.
- such motifs may be mutated to EG, DQ or DA.
- a methionine residue may be altered to replaced it with a different amino acid, for example leucine or phenylalanine.
- the anti-CD25 antibody or antigen-binding fragment thereof may be, or may be derived from, for example, an antibody comprising the sequences of SEQ ID NO: 1 and 3 (e.g. Antibody 1 ), an antibody comprising the sequences of SEQ ID NO: 1 and 4 (e.g. Antibody 2), an antibody comprising the sequences of SEQ ID NO: 2 and 3 (e.g. Antibody 3) or an antibody comprising the sequences of SEQ ID NO: 2 and 4 (e.g. Antibody 4).
- the variant anti-CD25 antibodies including affinity matured variants, provide further antibodies having any, and possibly all, binding and functional properties of the antibodies.
- the variant anti-CD25 antibodies are non-IL-2 blocking antibodies.
- the antibodies or fragments thereof provided herein may undergo modification (for example affinity maturation) before arriving at a final sequence.
- a variant antibody having the variable heavy and variable light chain of any antibody as disclosed herein (for example the variable heavy and variable light chain of Antibody 1 , the variable heavy and variable light chain of Antibody 2, the variable heavy and variable light chain of Antibody 3 or the variable heavy and variable light chain of Antibody 4, described herein), but differing from the specified sequence in that at least one or at least two DG or NG motifs (if present) or methionine residues in the CDRs (if present) have been changed to a different motif.
- the disclosed variants may be used and formulated as described for other Anti-CD25 Antibody Agents.
- the invention also provides affinity matured antibodies, for example affinity matured variants derived from any of the antibodies disclosed herein.
- the affinity matured antibodies are affinity matured antibodies that are further altered to remove or mutate any DG motifs and/or NG motifs, and altered to remove or mutate any methionine residues.
- the present invention provides affinity matured variants of the anti-CD25 antibodies.
- the invention provides a method of preparing an anti-CD25 antibody comprising providing an antibody as herein described (e.g., Antibody 1 , 2, 3 or 4 or an antigen binding fragment or variant thereof), and subjecting the antibody to affinity maturation, wherein the antibody produced binds to CD25 with greater affinity than the parental antibody.
- the produced antibody binds to CD25 with at least 20%, at least 30%, at least 40%, more preferably at least 50% greater affinity than the parental antibody binds to CD25, for example as measured by the Kd.
- the present invention provides methods for preparing an affinity matured antibody, comprising: a. providing a parental antibody comprising the variable heavy chain sequence of SEQ ID NO: 1 and the variant light chain sequence of SEQ ID NO: 3, and subjecting the antibody to affinity maturation, wherein the affinity matured antibody binds to CD25 with at least 20% higher affinity than the parental antibody; or b. providing a parental antibody comprising the variable heavy chain sequence of SEQ ID NO: 1 and the variant light chain sequence of SEQ ID NO: 4, and subjecting the antibody to affinity maturation, wherein the affinity matured antibody binds to CD25 with at least 20% higher affinity than the parental antibody; or c.
- a parental antibody comprising the variable heavy chain sequence of SEQ ID NO: 2 and the variant light chain sequence of SEQ ID NO: 3, and subjecting the antibody to affinity maturation, wherein the affinity matured antibody binds to CD25 with at least 20% higher affinity than the parental antibody; or d. providing a parental antibody comprising the variable heavy chain sequence of SEQ ID NO: 2 and the variant light chain sequence of SEQ ID NO: 4, and subjecting the antibody to affinity maturation, wherein the affinity matured antibody binds to CD25 with at least 20% higher affinity than the parental antibody;
- Affinity maturation may be carried out according to any suitable method known to the skilled person.
- in vitro antibody display systems are widely used for the generation of specific antibodies with high affinity.
- the phenotype i.e., the antibody fragment
- genotype i.e., the antibody gene
- the antibody fragments can be expressed in yeast, ribosomes, phage display particles or by direct coupling to DNA.
- the method of affinity maturation is selected from the group consisting of stochastic mutagenesis (for example error-prone polymerase chain reaction (PCR), mutator bacterial strains, or saturation mutagenesis), non-stochastic mutagenesis (for example alanine-scanning or site-directed mutagenesis), shuffling (for example DNA shuffling, chain shuffling or CDR shuffling) and the use of the CRIPR-Cas9 system to introduce modifications.
- stochastic mutagenesis for example error-prone polymerase chain reaction (PCR), mutator bacterial strains, or saturation mutagenesis
- non-stochastic mutagenesis for example alanine-scanning or site-directed mutagenesis
- shuffling for example DNA shuffling, chain shuffling or CDR shuffling
- CRIPR-Cas9 system to introduce modifications.
- Affinity maturation methods are described in, for example, Rajpal et al., Proc Natl Acad Sci USA, 2005, 102(24):8466-71 , Steinwand et al., MAbs, 2014, 6(1 ):204-18, as well as in Handbook of Therapeutic Antibodies, Wiley, 2014, Chapter 6, Antibody Affinity (pages 1 15-140).
- a method of preparing a pharmaceutical composition comprising providing an antibody prepared according to a method above, (i.e. for producing an antibody by affinity maturation) and co-formulating the antibody with at least one or more pharmaceutically acceptable excipients.
- the antibody used in the preparation of the pharmaceutical composition can be an affinity matured variant of Antibody 1 , Antibody 2, Antibody 3 or Antibody 4.
- the pharmaceutical compositions produced by such methods can be used in the methods of treatment of the present invention as described herein for the other anti-CD25 Antibody Agents.
- Affinity matured antibodies and pharmaceutical compositions obtained or obtainable by the above methods are also provided.
- Antibodies and/or antigen-binding fragments that specifically bind CD25 as described herein may be provided in any of a variety of formats.
- an appropriate format may be or comprise a monoclonal antibody, a domain antibody, a single chain antibody, a Fab fragment, a F(ab')2 fragment, a single chain variable fragment (scFv), a scFv-Fc fragment, a single chain antibody (scAb), an aptamer, or a nanobody.
- an antibody or antigen-binding fragment or variant thereof may be a humanized or fully human antibody or antigen-binding fragment or variant thereof.
- a provided antibody or antigen-binding fragment or variants thereof may be of an IgG, IgA, IgE, or IgM isotype (preferably human ones), as it can be most appropriate for a given use.
- a provided antibody or antigen- binding fragment or variant thereof is an IgG isotype, more particularly an lgG1 , lgG2, lgG3, or lgG4 isotype.
- the antibody or antigen-binding fragment or variant thereof is from the human lgG1 subclass. In another embodiment the antibody or antigen-binding fragment or variant thereof is from the human lgG2 subclass).
- a provided antibody or antigen-binding fragment or variant thereof is provided as part of a multi-specific binding agent such as, for example, when it is desirable to associate further binding and/or functional moieties to anti-CD25 Antibody Agents such as an Antibody 1 amino acid sequence, an Antibody 2 amino acid sequence, an Antibody 3 amino acid sequence or an Antibody 4 amino acid sequence.
- the isolated antibody or antigen-binding fragment can be comprised in a bispecific antibody, a multispecific antibody, or other multi-specific format that may be available in the art.
- a provided anti-CD25 Antibody Agent comprises a CD25- binding entity (e.g., an anti-CD25 antibody or antigen-binding fragment or variant thereof, as described herein) and a conjugated payload such as a therapeutic or diagnostic agent.
- a CD25- binding entity e.g., an anti-CD25 antibody or antigen-binding fragment or variant thereof, as described herein
- a conjugated payload such as a therapeutic or diagnostic agent.
- the agent is considered and/or referred to as an
- immunoconjugate examples of technologies and compounds that can be used for generating specific immunoconjugates such as antibody-drug are disclosed in the literature (Beck A et al., 2017) and described as applicable to several known anti-CD25 antibodies (O’Mahony D et al, 2008; Oh et al, 2017; Kreitman RJ et al, 2016; Flynn MJ et al 2016).
- the present invention provides anti-CD25 antibodies or antigen-binding fragments or variants, that specifically bind to an epitope of human CD25, wherein the epitope comprises one or more amino acid residues comprised in the amino acids 150-163 of SEQ ID NO:5 and/or amino acids 166-180 of SEQ ID NO:5.
- the epitope comprises at least 4 amino acids wherein the epitope comprises one or more amino acids comprised in amino acids 150-163 of SEQ ID NO:5 and/or amino acids 166- I SO of SEQ ID NO:5.
- the epitope comprises at least 5 amino acids, at least 6 amino acids, at least seven amino acids, at least eight amino acids, at least nine amino acids, at least ten amino acids, at least eleven amino acids, at least twelve amino acids, at least thirteen amino acids, or at least fourteen or more amino acids wherein the epitope comprises one or more amino acids comprised in amino acids 150-163 of SEQ ID NO:5 and/or amino acids 166-180 of SEQ ID NO:5.
- the epitope may be either linear or conformational, i.e. discontinuous.
- the anti-CD25 antibodies or antigen-binding fragments specifically bind to an epitope of human CD25 wherein the epitope comprises at least two, at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven, at least twelve, at least thirteen, or at least fourteen or more amino acid residues comprised in amino acids 150-163 of SEQ ID NO:5 and/or amino acids 166-180 of SEQ ID NO:5.
- the anti-CD25 antibodies or antigen-binding fragments bind to an epitope comprising amino acids 150-163 of SEQ ID NO:5 (protein sequence
- YQCVQGYRALHRGP amino acids 150-163 in Uniprot sequence P01589) and amino acids 166-180 of SEQ ID NO:5 (protein sequence SVCKMTHGKTRWTQP; amino acids 166-180 in Uniprot sequence P01589).
- the present invention provides nucleic acid molecules encoding an isolated antibody or antigen-binding fragment thereof that comprises an anti- CD25 Antibody Agent such as an Antibody 1 amino acid sequences (i.e. SEQ ID NO:1 and 3), an Antibody 2 amino acid sequences (i.e. SEQ ID NO: 1 and 3), an Antibody 3 amino acid sequences (i.e. SEQ ID NO: 2 and 3) and an Antibody 4 amino acid sequences (i.e. SEQ ID NO: 2 and 4).
- an Antibody 1 amino acid sequences i.e. SEQ ID NO:1 and 3
- an Antibody 2 amino acid sequences i.e. SEQ ID NO: 1 and 3
- an Antibody 3 amino acid sequences i.e. SEQ ID NO: 2 and 3
- an Antibody 4 amino acid sequences i.e. SEQ ID NO: 2 and 4
- nucleic acid molecules may contain codon-optimized nucleic acid sequences, and/or may be included in expression cassettes within appropriate nucleic acid vectors for the expression in host cells such as, for example, bacterial, yeast, insect, piscine, murine, simian, or human cells.
- the present invention provides host cells comprising heterologous nucleic acid molecules (e.g. DNA vectors) that express a provided anti- CD25 Antibody Agent (e.g., an antibody or antigen-binding fragment or variant thereof) having one or more properties, e.g., as described herein, of an anti-CD25 Antibody Agent (e.g., of antibody comprising an Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequence).
- the present disclosure provides methods of preparing an anti-CD25 Antibody Agent (e.g., an antibody or antigen-binding fragment or variant thereof) having one or more properties, e.g., as described herein, of an anti-CD25 Antibody Agent (e.g.
- such methods may comprise culturing a host cell that comprises nucleic acids (e.g., heterologous nucleic acids that may comprise and/or be delivered to the host cell via vectors).
- nucleic acids e.g., heterologous nucleic acids that may comprise and/or be delivered to the host cell via vectors.
- such a host cell (and/or the heterologous nucleic acid sequences) is/are arranged and constructed so that the anti-CD25 Antibody Agent (e.g.
- the antibody or antigen-binding fragment or variant thereof is secreted from the host cell (e.g., so that it can be isolated from cell culture supernatants), and/or exposed on the cell surface (for instance, if such Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences are intended to be used in the context of, or together with, such cells, as in artificial T cell receptors grafting the specificity of a monoclonal antibody onto T cells).
- the antibody or antigen-binding fragment or variant may be afucosylated. It is well known that antibody glycosylation may have impact on the activity, pharmacokinetics and pharmacodynamics of antibodies (e.g., monoclonal antibodies, recombinant antibodies, and/or antibodies that are otherwise engineered or isolated) and Fc-fusion proteins and specific technology may be exploited to obtain an antibody with the desired glycosylation profile (Liu L, 2015).
- Effector functions supporting the cytotoxicity of an antibody for use in accordance with the present invention can be enhanced using methods to decrease antibody fucosylation levels.
- Antibodies comprising specific sequence elements presenting such properties can be generated, for example, by expressing the sequence of the antibodies, described herein, using technologies for genetically engineering cell lines with absent or reduced fucosylation capacity, some of them commercially available such as Potelligent (Lonza), GlyMAXX (ProBiogen), those provided by Evitria, or by manipulating the manufacturing process, for example by controlling osmolarity and/or using enzyme inhibitors, see also for example the methods described in EP2480671.
- compositions e.g.
- compositions comprising a provided antibody or an antigen-binding fragment or variant thereof having desirable properties as described herein.
- provided compositions are intended for and/or are used in a medical use, such as a therapeutic, diagnostic, or prophylactic use.
- a provided composition can further comprise a pharmaceutically acceptable carrier or excipient and/or may be for use in the treatment of cancer.
- a pharmaceutical composition may be formulated with one or more carrier, excipients, salts, buffering agents, etc., as is known in the art.
- provided pharmaceutical compositions comprising anti-CD25 Antibody Agent as described herein (e.g., an anti-CD25 antibody or antigen binding portion thereof, are formulated for parenteral delivery (e.g., by injection and/or infusion).
- a provided pharmaceutical composition may be provided, for example, in a pre-loaded syringe or vial format.
- such a provided pharmaceutical composition may be provided and/or utilized, for example, in dry (e.g., lyophilized) form; alternatively, in some embodiments, such a provided pharmaceutical composition may be provided and/or utilized in a liquid form (e.g., as a solution, suspension, dispersion, emulsion, etc), in a gel form, etc.
- a liquid form e.g., as a solution, suspension, dispersion, emulsion, etc
- the present invention provides uses of anti-CD25 Antibody Agents (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof) as described herein , and/or of a composition comprising them, in treatment of and/or in the manufacture of a medicament for treatment of, a cancer, such as a B cell malignancy, a lymphoma, (Hodgkins Lymphoma, non-Hodgkins lymphoma, chronic lymphocytic, leukemia, acute lymphoblastic leukemia, myelomas), a myeloproliferative disorder, a solid tumour (such as a breast carcinoma, a squamous cell carcinoma, a colon cancer, a head and neck cancer, a lung cancer, a genitourinary cancer, a rectal cancer, a gastric cancer, sarcoma, melanoma, an esophageal cancer, liver cancer, testicular cancer, cervical cancer, mastocyto
- a cancer such as
- the cancer can be also defined on the basis of presence of specific tumour-relevant markers and antigens such as CD20, HER2, PD-1 , PD-L1 , SLAM7F, CD47, CD137, CD134, TIM3, CD25, GITR, CD25, EGFR, etc or a cancer that has been identified as having a biomarker referred to as microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR).
- MSI-H microsatellite instability-high
- dMMR mismatch repair deficient
- pre-cancerous, non-invasive states of the above cancers such as cancer in-situ, smouldering myeloma, monoclonal gammopathy of undetermined significance, cervical intra-epithelial neoplasia, MALTomas/GALTomes and various lymphoproliferative disorders.
- the subject being treated has a solid tumour.
- the present invention provides methods of treating cancer in a subject, comprising administering to the subject an effective amount of a composition comprising a provided anti-CD25 Antibody Agent (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof) as described herein (e.g. comprising Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences).
- a provided anti-CD25 Antibody Agent e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof
- the subject has a solid tumour.
- the present invention provides a method of depleting regulatory T cells in a subject comprising the step of administering to the subject an effective amount of a composition comprising a provided anti-CD25 Antibody Agent (e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof) as described herein (e.g. Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences).
- a provided anti-CD25 Antibody Agent e.g., anti-CD25 antibodies or antigen-binding fragments or variants thereof
- the subject has a solid tumour.
- the subject has a haematological cancer.
- provided methods may further comprise administering, simultaneously or sequentially in any order, at least one additional agent or therapy to the subject (i.e., so that the subject receives a combination therapy).
- an at least one additional agent or therapy can be or comprise an anticancer drug (e.g., a chemotherapeutic agent), radiotherapy (by applying irradiation externally to the body or by administering radio-conjugated compounds), an anti-tumour antigen or marker antibody (the antigen or marker being for example CD4, CD38, CA125, PSMA, c-MET, VEGF, CD137, VEGFR2, CD20, HER2, HER3, SLAMF7, CD326, CAIX, CD40, CD47, or EGF receptor), a checkpoint inhibitor or an immunomodulating antibody (for example an antibody targeting PD-1 , PD-L1 , TIM3, CD38, GITR, CD134, CD134L, CD137, CD137L, CD80, CD86, B
- an anticancer drug e.g
- the additional agent is an immune checkpoint inhibitor such as a PD-1 antagonist, for example an anti-PD-1 antibody or an anti-PD-L1 antibody.
- a PD-1 antagonist for example an anti-PD-1 antibody or an anti-PD-L1 antibody.
- the format of and/or the antigen targeted by such antibody can be chosen among those listed in the literature and possibly adapted to a given cancer (Sliwkowski M & Mellman I, 2013; Redman JM et al., 2015; Kijanka M et al., 2015).
- Such antigens and corresponding antibodies include, without limitation CD22 (Blinatumomab), CD20 (Rituximab, Tositumomab), CD56 (Lorvotuzumab), CD66e/CEA (Labetuzumab), CD152/CTLA-4 (Ipilimumab), CD221/IGF1 R (MK-0646), CD326/Epcam (Edrecolomab), CD340/HER2 (Trastuzumab, Pertuzumab), and EGFR (Cetuximab, Panitumumab).
- the at least one additional agent or therapy is a chemotherapeutic agent
- the chemotherapeutic agent can be those known in the art for use in cancer therapy.
- Such chemotherapeutic agents includes, without limitation, alkylating agents, anthracyclines, epothilones, nitrosoureas,
- ethylenimines/methylmelamine alkyl sulfonates, alkylating agents, antimetabolites, pyrimidine analogs, epipodophylotoxins, enzymes such as L- asparaginase; biological response modifiers such as IFNa, IFN-g, IL-2, IL-12, G-CSF and GM-CSF; platinum coordination complexes such as cisplatin, oxaliplatin and carboplatin, anthracenediones, substituted urea such as hydroxyurea, methylhydrazine derivatives including N- methylhydrazine (MIH) and procarbazine, adrenocortical suppressants such as mitotane (o,r'-DDD) and aminoglutethimide; hormones and antagonists including
- adrenocorticosteroid antagonists such as prednisone and equivalents, dexamethasone and aminoglutethimide; progestin such as hydroxyprogesterone caproate,
- medroxyprogesterone acetate and megestrol acetate include estrogen such as diethylstilbestrol and ethinyl estradiol equivalents; antiestrogen such as tamoxifen; androgens including testosterone propionate and fluoxymesterone/equivalents; antiandrogens such as flutamide, gonadotropin-releasing hormone analogs and leuprolide; non-steroidal antiandrogens such as flutamide; molecules that target TGF3 pathways, IDO (indoleamine deoxigenase), Arginase, and/or CSF1 R; PARP inhibitors such as olaparib, Veliparib, Iniparib, Rucaparib; and MET inhibitors such as tivantinib, foretinib, golvatinib,
- the present invention provides a variety of kits or articles of
- a provided anti-CD25 Antibody Agent e.g., anti-CD25 antibody or antigen-binding fragment or variant thereof as described herein (e.g. comprising Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences) or related compositions that allow the administration, storage, or other use of such an isolated antibody or antigen- binding fragment.
- a provided kit comprises a vessel, syringe, a vial, or other container comprising such compositions, optionally together with one or more articles of manufactures, diluents, reagents, solid phases, and/or instructions for the correct use of the kit.
- identification, characterization, and/or validation of particular anti-CD25 Antibody Agent e.g., anti-CD25 antibody or antigen-binding fragment or variant thereof as described herein (e.g. comprising Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences) for a particular use, such as a medical use, and in particular for treating cancer, can be performed by using one or more assays or systems as described herein.
- identification, characterization, and/or validation may involve analysis of activity in one or more cell-based assays, for example using different experimental set-ups and/or a panel of selected (e.g., cancer-derived cell lines).
- desirable identification, characterization, and/or validation can involve collection of relevant data generated in animal models wherein cancers are induced or wherein cancer cells are implanted as a xenograft or as a syngeneic/allogeneic cancer-derived cells.
- animal models may be utilized that involve transfer of human cells such as PBMC (i.e. humanized PBMC mouse models) or CD34+ hematopoietic stem cells alone (i.e. CD34+ humanized mice) or CD34+ hematopoietic stem cells together with liver and thymus (e.g. NSG-BLT mice) to allow evaluating activity of the anti-CD25 Antibody Agents on human immune cells within a model system.
- relevant sequences of anti-CD25 Antibody Agents can be cloned into and/or expressed in context of an antibody frame that is more appropriate or desirable for pharmaceutical and/or technical reasons.
- sequences can be cloned together with human lgG1 constant regions (hlgG1 ) and expressed using an appropriate antibody expression vectors and cell line (such as a CHO-derived cell line, e.g. CHO-S).
- expression and secretion of provided antibody sequences in human lgG1 format antibodies can be analyzed after transfection in reduced conditions in cell lysates and in non-reduced conditions in supernatants that will be later used to purify the antibody (by affinity chromatography, gel filtration, and/or other appropriate technique).
- Binding and/or other functional properties of provided anti-CD25 antibody sequences, in human lgG1 format e.g., anti-CD25 Antibody Agents-hlgG1
- binding and/or other functional properties of provided anti-CD25 antibody sequences, in human lgG1 format can be analysed, for example by using one or more assays described in Examples below.
- hlgG1 -format provided antibodies can be evaluated for binding to human and cynomolgus PBMC or purified Treg or in vitro derived Treg or CD25 positive cell lines (such as SU-DHL-1 or Karpas299), e.g., using flow cytometry.
- anti-CD25 Antibody Agents e.g., anti-CD25 antibody or antigen-binding fragments or variants thereof
- anti-CD25 antibody or antigen-binding fragments or variants thereof as described herein (e.g.
- the antibodies can be used to treat PBMC and/or cells isolated from tumours (and/or organs such as lymph nodes) and/or tumour explants or other 3D organoids and/or purified or in vitro generated regulatory T cells or other CD25 positive cells such as some NK cells or Dendritic cells.
- Potential read outs comprise CD25 positive cells viability, elimination and/or apoptosis, tumour cell killing, effector immune cells proliferation and function (e.g. Granzyme B production, cytotoxic activity, degranulation), antigen-specific responses (as measured for example by proliferation, degranulation or cytokine production in response to an antigen).
- mice or non-human primates can be treated and cellular status can be followed in blood samples ( analysesd as whole blood or isolated PBMCs) or after isolation of various organs and/or cells from the animals, by e.g. flow cytometry or immune- histochemistry.
- one or more properties of anti-CD25 Antibody Agents e.g., anti-CD25 antibody or antigen-binding fragments or variants thereof as described herein (e.g. an antibody comprising amino acid sequences of Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 or otherwise including structural and/or functional characteristics of an agent described herein as an anti-CD25 Antibody Agent - such as an anti-CD25 Antibody Agents-hlgG1 ) may be evaluated, alone or in combination, by studying the effects of such anti-CD25 Antibody Agents on CD25 expressing cells (e.g. Tregs or CD25- expressing cancer cells).
- CD25 expressing cells e.g. Tregs or CD25- expressing cancer cells.
- Read out can include cell killing, cell apoptosis, intra-cellular signalling monitoring (e.g. Stat-5 phosphorylation), impact on IL-2 binding to CD25 and signalling (e.g. Stat-5 phosphorylation or other signalling downstream of the IL-2 receptor) and IL-2 dependent functional activities (e.g. proliferation and cytokine production).
- intra-cellular signalling monitoring e.g. Stat-5 phosphorylation
- impact on IL-2 binding to CD25 and signalling e.g. Stat-5 phosphorylation or other signalling downstream of the IL-2 receptor
- IL-2 dependent functional activities e.g. proliferation and cytokine production.
- the crystal structure of the anti-CD25 Antibody Agent e.g., an Antibody 1-hlgG1 antibody, Antibody 2-hlgG1 antibody, Antibody 3-hlgG1 antibody, or Antibody 4-hlgG1 antibody
- human CD25 protein can be determined.
- Solubility and/or stability of provided anti-CD25 Antibody Agents can be assessed through solubility studies, accelerated stress studies, freeze thaw studies and formal stability studies. Aggregation of the antibodies can be followed by visual inspection, size exclusion chromatography and dynamic light scattering and O D280/320 absorbance.
- Figure 1 Relevant protein sequences of Antibody 1 , Antibody 2, Antibody 3 and Antibody 4. Heavy chain sequences (A) - SEQ ID NO:1 and (B) - SEQ ID NO:2, and light chain sequences (C) - SEQ ID NO:3, and (D) - SEQ ID NO:4. The CDRs for each chain are underlined (Kabat definition scheme).
- Figure 2 Consensus sequence of human CD25 (Uniprot code P01589) (SEQ ID NO:5). The extracellular domain of mature CD25, corresponding to amino acids 22-240, is underlined. The position of the epitope of Antibody 1 , Antibody 2, Antibody 3 and Antibody 4 as preliminarily identified as aCD25ep-a and aCD25ep-b is indicated.
- Figure 3 Characterization of Antibody 1 , Antibody 2, Antibody 3 and Antibody 4 binding to CD25 expressed on Karpas 299 cells at increasing antibody concentrations and comparing with human lgG1 isotype control.
- Figure 4 SPR based analysis of purified the antibodies (lgG1 ) to rhCD25 his tagged on the Biacore 2000.
- A Antibody 1.
- B Antibody 2.
- C Antibody 3.
- D Antibody 4.
- Figure 5 Competition assays in the Octet. Binding the first Ab (Antibody 2) to the immobilized rhCD25 followed by either the first Ab again (as control) or a second Ab Daclizumab (A) or Basiliximab (B).
- Figure 6 Characterization of Antibody 1 , Antibody 2, Antibody 3 and Antibody 4 compared to human lgG1 isotype control, Daclizumab-Hyp, or in the absence of a primary antibody, in respect to blocking IL-2 signalling in a STAT5 phosphorylation assay using PBMCs of human origin. Cells were incubated with 10pg/ml antibody and 10U/ml of IL-2. Analysis was restricted to percentage of CD3-positive cells phosphorylating STAT5.
- Figure 7 Functional characterization of Antibody 2 compared to an anti-human CD25 Fc silent control antibody in respect to inducing ADCC in a Reporter Bioassay.
- CD25 expressing SR-786 cells were co-cultured with Jurkat T cells genetically engineered to express FcyRIIIa and an NFAT-response element that drives luciferase expression (NFAT-RE-luc2) in the presence of varying concentrations of antibodies (as shown in the Figures).
- Figure 8 Functional characterization of Antibody 2 compared to an anti-human CD25 Fc silent control antibody in respect to phagocytosis of in-vitro differentiated Treg cells in an ADCP assay.
- Tregs were co-cultured with MCSF differentiated Macrophages in the presence of varying concentrations of antibodies (as shown in the Figures).
- Two colour flow cytometric analysis was performed with CD14+ stained Macrophages and eFluor450-dye labelled Tregs. Residual target cells were defined as cells that were eFluor450-dye7CD14 .
- Figure 9 Evaluation of the therapeutic activity of 7D4 mlgG2a, an anti-mouse CD25 non-IL-2 blocking, Treg depleting antibody alone (D) and in combination with an IL- 2 neutralizing antibody (E) or an IL-2 blocking antibody (F) in mice bearing CT26 syngeneic colon tumours in female BALB/c mice.
- the activity of mouse lgG2a control (A), an IL-2 neutralizing antibody alone (B) and an IL-2 blocking antibody alone (C) were tested for comparison.
- administration of a composition to a subject may be by any appropriate route.
- administration may be bronchial (including by bronchial instillation), buccal, enteral, intra- arterial, intra-dermal, intra-gastric, intra-medullary, intra-muscular, intra-nasal, intra- peritoneal, intra-thecal, intra-venous, intra-ventricular, within a specific organ or tissue (e. g. intra-hepatic, intra-tumoral, peri-tumoral, etc), mucosal, nasal, oral, rectal,
- bronchial including by bronchial instillation
- buccal enteral, intra- arterial, intra-dermal, intra-gastric, intra-medullary, intra-muscular, intra-nasal, intra- peritoneal, intra-thecal, intra-venous, intra-ventricular, within a specific organ or tissue (e. g. intra-hepatic, intra-tumoral, peri-tumoral, etc), muco
- the administration may involve intermittent dosing.
- administration may involve continuous dosing (e.g., perfusion) for at least a selected period of time.
- antibody therapy is commonly administered parenterally, e.g. by intravenous, subcutaneous, or intratumoral injection (e.g., particularly when high doses within a tumour are desired).
- agent may refer to a compound or entity of any chemical class including, for example, polypeptides, nucleic acids, saccharides, small molecules, metals, or combinations thereof.
- agents that may be utilized in accordance with the present invention include small molecules, drugs, hormones, antibodies, antibody fragments, aptamers, nucleic acids (e.g., siRNAs, shRNAs, antisense oligonucleotides, ribozymes), peptides, peptide mimetics, etc.
- An agent may be or comprise a polymer.
- Antibody refers to a polypeptide that includes canonical immunoglobulin sequence elements sufficient to confer specific binding to a particular target antigen, such as CD25, human CD25 in particular, and human CD25 extracellular domain.
- a particular target antigen such as CD25, human CD25 in particular, and human CD25 extracellular domain.
- intact antibodies as produced in nature are approximately 150 kD tetrameric agents comprised of two identical heavy chain polypeptides (about 50 kD each) and two identical light chain polypeptides (about 25 kD each) that associate with each other into what is commonly referred to as a“Y-shaped” structure.
- Each heavy chain is comprised of at least four domains (each about 1 10 amino acids long), an amino-terminal variable (VH) domain (located at the tips of the Y structure), followed by three constant domains: CH1 , CH2, and the carboxy-terminal CH3 (located at the base of the Y’s stem).
- VH amino-terminal variable
- CH1 , CH2 amino-terminal variable
- CH3 carboxy-terminal CH3
- Each light chain is comprised of two domains - an amino-terminal variable (VL) domain, followed by a carboxy-terminal constant (CL) domain, separated from one another by another“switch”.
- Intact antibody tetramers are comprised of two heavy chain-light chain dimers in which the heavy and light chains are linked to one another by a single disulfide bond; two other disulfide bonds connect the heavy chain hinge regions to one another, so that the dimers are connected to one another and the tetramer is formed.
- Naturally produced antibodies are also glycosylated, typically on the CH2 domain, and each domain has a structure characterized by an“immunoglobulin fold” formed from two beta sheets (e.g., 3-, 4-, or 5-stranded sheets) packed against each other in a compressed antiparallel beta barrel.
- Each variable domain contains three hypervariable loops known as“complement determining regions” (CDR1 , CDR2, and CDR3; as understood in the art, for example determined according to Kabat numbering scheme) and four somewhat invariant“framework” regions (FR1 , FR2, FR3, and FR4).
- the FR regions form the beta sheets that provide the structural framework for the domains, and the CDR loop regions from both the heavy and light chains are brought together in three-dimensional space so that they create a single hypervariable antigen-binding site located at the tip of the Y structure.
- the Fc region of naturally-occurring antibodies binds to elements of the complement system, and also to receptors on effector cells, including for example effector cells that mediate cytotoxicity.
- affinity and/or other binding attributes of Fc regions for Fc receptors can be modulated through glycosylation or other modification that can improve the developability of the antibody (Jarasch A et al., 2015).
- antibodies produced and/or utilized in accordance with the present invention include glycosylated Fc domains, including Fc domains with modified or engineered such glycosylation.
- any polypeptide or complex of polypeptides that includes sufficient immunoglobulin domain sequences as found in natural antibodies can be referred to and/or used as an“antibody”, whether such polypeptide is naturally produced (e.g., generated by an organism reacting to an antigen), or produced by recombinant engineering, chemical synthesis, or other artificial system or methodology.
- an antibody is polyclonal or oligoclonal, that is generated as a panel of antibodies, each associated to a single antibody sequence and binding more or less distinct epitopes within an antigen (such as different epitopes within human CD25 extracellular domain that are associated to different reference anti-CD25 antibodies).
- Polyclonal or oligoclonal antibodies can be provided in a single preparation for medical uses as described in the literature (Kearns JD et al., 2015). In some
- an antibody is monoclonal.
- an antibody has constant region sequences that are characteristic of mouse, rabbit, primate, or human antibodies.
- antibody sequence elements are humanized, primatized, chimeric, etc, as is known in the art.
- the term“antibody” as used herein can refer in appropriate embodiments (unless otherwise stated or clear from context) to any of the art-known or developed constructs or formats for utilizing antibody structural and functional features in alternative presentation, for instance as antigen- binding fragments as defined below.
- an antibody utilized in accordance with the present invention is in a format selected from, but not limited to, intact IgG, IgE and IgM, bi- or multi- specific antibodies (e.g., Zybodies®, etc), single chain variable domains (scFv), polypeptide-Fc fusions, Fabs, cameloid antibodies, heavy-chain shark antibody (IgNAR), masked antibodies (e.g., Probodies®), or fusion proteins with polypeptides that allow expression and exposure on the cell surface (as scFv within constructs for obtaining artificial T cell receptors that are used to graft the specificity of a monoclonal antibody onto a T cell).
- a masked antibody can comprise a blocking or“mask” peptide that specifically binds to the antigen binding surface of the antibody and interferes with the antibody’s antigen binding.
- the mask peptide is linked to the antibody by a cleavable linker (e.g. by a protease). Selective cleavage of the linker in the desired environment, e.g. in the tumour environment, allows the masking/blocking peptide to dissociate, enabling antigen binding to occur in the tumour, and thereby limiting potential toxicity issues.
- an antibody may lack a covalent modification (e.g., attachment of a glycan) that it would have if produced naturally.
- an antibody may contain a covalent modification (e.g., attachment of a glycan, a payload [e.g., a detectable moiety, a therapeutic moiety, a catalytic moiety, etc.], or other pendant group [e.g., poly-ethylene glycol, etc.]).
- Non-IL-2 Blocking Antibody Agent The anti-CD25 Antibody Agents and antigen-binding fragments of the present invention are non-IL-2 blocking antibody agents.
- the term“Non-IL-2 blocking antibody agent” is used herein to refer to those anti-CD25 antibody agents (e.g. anti-CD25 non-IL-2 blocking antibodies) that are capable of specific binding to the CD25 subunit of the IL-2 receptor without blocking the binding of IL- 2 to CD25 or signalling of IL-2 via CD25.
- the anti-CD25 Antibody Agents allow at least 50% of IL-2 signaling in response to IL-2 binding to CD25 compared to the level of signaling in the absence of the anti-CD25 Antibody Agent.
- the anti-CD25 Antibody Agents allow at least 75% of IL-2 signaling in response to CD25 compared to the level of signaling in the absence of the anti-CD25 Antibody Agent.
- the CD25 subunit of the IL-2 receptor is also known as the alpha subunit of the IL- 2 receptor and is found on activated T cells, regulatory T cells, activated B cells, some thymocytes, myeloid precursors and oligodendrocytes.
- CD25 associates with CD122 and CD132 to form a heterotrimeric complex that acts as the high-affinity receptor for IL-2.
- the consensus sequence of human CD25 is shown in Figure 2.
- Specific binding means that the antibody or antigen-binding fragment has a dissociation constant (K d ) for the antigen of interest of less than about 10 6 M, 10 7 M, 10 8 M, 10 9 M, 10 1 ° M, 10 11 M or 10 12 M.
- the dissociation constant is less than 10 8 M, for instance in the range of 10 9 M, 10 1 ° M, 10 11 M or 10 12 M.
- Non-IL-2 blocking as used herein and references to“non-blocking”,“does not block” and the like (with respect to the non-blocking of IL-2 binding to CD25 in the presence of the anti-CD25 antibody) include embodiments wherein the anti-CD25 antibody or antigen-binding fragment inhibit less than 50% of IL-2 signalling compared to IL-2 signalling in the absence of the antibodies. In particular embodiments of the invention as described herein, the anti-CD25 antibody or antigen-binding fragment inhibits less than about 40%, 35%, 30%, preferably less than about 25% of IL-2 signalling compared to IL-2 signaling in the absence of the antibodies. Anti-CD25 non-IL-2 blocking antibodies allow binding to CD25 without interfering with IL-2 binding to CD25, or without
- references herein to a non-IL-2 blocking antibody may alternatively be expressed as an anti-CD25 antibody that“does not inhibit the binding of interleukin 2 to CD25” or as an anti-CD25 antibody that“does not inhibit the signalling of IL-2”.
- Some anti-CD25 Antibody Agents may allow binding of IL-2 to CD25, but still block signalling via the CD25 receptor. Such Antibody Agents are not within the scope of the present invention. Instead, the non-IL-2 blocking anti-CD25 Antibody Agents allow binding of IL-2 to CD25 to facilitate at least 50% of the level of signalling via the CD25 receptor compared to the signalling in the absence of the anti-CD25 Antibody Agent.
- IL-2 signalling via CD25 may be measured by methods as discussed in the Example and as known in the art. Comparison of IL-2 signalling in the presence and absence of the anti-CD25 antibody agent can occur under the same or substantially the same conditions.
- IL-2 signalling can be determined by measuring by the levels of phosphorylated STAT5 protein in cells, using a standard Stat-5
- a Stat-5 phosphorylation assay to measure IL-2 signalling may involve culturing PMBC cells in the presence of the anti-CD25 antibody at a concentration of 10ug/ml for 30 mins and then adding varying concentrations of IL-2 (for example at 10U/ml or at varying concentrations of 0.25U/ml, 0.74U/ml, 2.22U/ml,
- % blocking 100 x [(% Stat5 + cells No Antibody group - % Stat5 + cells 10ug/ml Antibody group) / (% Stat5 + cells No Ab group)].
- the anti-CD25 Antibody Agents as described herein are characterized in that they deplete tumour-infiltrating regulatory T cells efficiently, in particular within tumours.
- anti-CD25 Antibody Agents are characterised in that they bind Fey receptor with high affinity, preferably at least one activating Fey receptor with high affinity.
- the antibody binds to at least one activatory Fey receptor with a dissociation constant of less than about 10 6 M, 10 7 M, 10 8 M, 10 9 M or 10 10 M.
- the anti-CD25 Antibody agents are characterized by other features related to Fey receptors, in particular:
- the CD25 Antibody agent is an lgG1 antibody, preferably a human lgG1 antibody, which is capable of binding to at least one Fc activating receptor.
- the antibody may bind to one or more receptor selected from FcyRI, FcyRIla, FcyRIIc, FcyRIIIa and FcyRIIIb.
- the antibody is capable of binding to FcyRIIIa.
- the antibody is capable of binding to FcyRIIIa and FcyRIla and optionally FcyRI. In some embodiments, the antibody is capable of binding to these receptors with high affinity, for example with a dissociation constant of less than about 10 7 M, 10 8 M, 10- 9 M or 10 1 °M. In some embodiments, the antibody binds an inhibitory receptor, FcyRI lb, with low affinity. In one aspect, the antibody binds FcyRIIb with a dissociation constant higher than 10 7 M, higher than 10 6 M or higher than 10 5 M.
- desirable anti-CD25 Antibody Agents as described herein are characterized in that they are cytotoxic towards or induce phagocytosis of CD25 expressing cells (e.g. expressing high levels of CD25) such as immune suppressive cells or tumour cells (e.g., in each case, that express CD25 on their surfaces).
- an anti-CD25 Antibody Agent is characterized by an activity (e.g., level and/or type) reasonably comparable to that of Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 with respect to immune cells (e.g., when contacted with immune cells, and particularly with immune cells that express CD25) and tumour cells.
- an activity e.g., level and/or type
- a relevant activity is or comprises depleting Treg cells (e.g. in a solid tumour), or certain CD25-expressing cells (e.g., high-expressing cells) by ADCP, ADCC or CDC, promotion of T cell, B cell or NK cell expansion, skewing of T cell repertoire, etc., and combinations thereof.
- an increased level and/or activity, or decreased level and/or increased or no change in level or activity is assessed or determined relative to that observed under otherwise comparable conditions in absence of the entity(ies) or moiety(ies).
- an increased level and/or activity is comparable to or greater than that observed under comparable conditions when a reference anti-CD25 Antibody Agents (e.g., an appropriate reference anti-CD25 antibody, which in many embodiments is a CD25 antibody that blocks IL-2 binding to CD25, such as Daclizumab or Basiliximab) is present.
- a reference anti-CD25 Antibody Agent for use in accordance with the present disclosure is or comprises an entity or moiety that binds, directly or indirectly, to CD25, typically to its extracellular domain.
- an anti-CD25 Antibody Agent is, or comprises, an antigen-binding fragment (e.g., comprising all heavy chain CDRs, all light chain CDRs, all CDRs, a heavy chain variable region, a light chain variable region, or both heavy and light chain variable regions) thereof, an affinity matured variant thereof (or an antigen-binding fragment thereof), or any alternative format (e.g., humanized, multispecific, alternate isotype, etc) of any of the foregoing.
- an antigen-binding fragment e.g., comprising all heavy chain CDRs, all light chain CDRs, all CDRs, a heavy chain variable region, a light chain variable region, or both heavy and light chain variable regions
- an affinity matured variant thereof or an antigen-binding fragment thereof
- any alternative format e.g., humanized, multispecific, alternate isotype, etc
- an anti-CD25 Antibody Agent as described herein may be characterized by one or more features that may be features that are advantageous for screening, manufacturing, (pre-clinical testing, and/or for identifying relevant epitope within human CD25, such as the sequence identified as aCD25ep-a or aCD25ep-b), and/or for formulation, administration, and/or efficacy in particular contexts (e.g., for cancer therapy), as disclosed herein.
- Percent (%) sequence identity Percent (%)“sequence identity" between two sequences can be determined using those methods known in the art. Sequence identity with respect to a peptide, polypeptide or antibody sequence can be defined as the percentage of amino acid residues in a candidate sequence that are identical with the amino acid residues in the specific peptide or polypeptide sequence, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity, and not considering any conservative substitutions as part of the sequence identity.
- Alignment for purposes of determining percent amino acid sequence identity can be achieved in various ways that are within the skill in the art, for instance, using publicly available computer software such as BLAST, BLAST-2, including gapped BLAST, and BLASTp (for proteins), (Altschul SF et al (1997)), or FASTA., using the default
- Percent % as known in the art is also the relationship between two or more polynucleotide sequences, as determined by comparing the sequences. Further computer programs to determine identity between two sequences include, but are not limited to, GCG program package (Devereux, et al., Nucleic Acids Research, 12, 387 (1984) and BLASTN. Generally, references to % identity herein refer to % identity along the entire length of the molecule, unless the context specifies or implies otherwise.
- Antigen refers to an agent that elicits an immune response and/or that binds to a T cell receptor (e.g., when presented by an MHC molecule) and/or B cell receptor.
- An antigen that elicits a humoral response involve the production of antigen-specific antibodies or, as shown in the Examples for CD25 extracellular domain, can be used for screening antibody libraries and identifying candidate antibody sequences to be further characterized.
- Antigen-binding Fragment encompasses agents that include or comprise one or more portions of an antibody as described herein sufficient to confer on the antigen-binding fragment and ability to specifically bind to the Antigen targeted by the antibody.
- the term encompasses any polypeptide or polypeptide complex that includes immunoglobulin structural elements sufficient to confer specific binding.
- Exemplary antigen-binding fragments include, but are not limited to Small Modular ImmunoPharmaceuticals (“SMIPsTM”), single chain antibodies, cameloid antibodies, single domain antibodies (e.g., shark single domain antibodies), single chain or Tandem diabodies (TandAb®), VHHs, Anticalins®, Nanobodies®, minibodies, BiTE®s, ankyrin repeat proteins or DARPINs®, Avimers®, a DART, a TCR-like antibody, Adnectins®, Affilins®, Trans-bodies®, Affibodies®, a TrimerX®, MicroProteins, Centyrins®, CoVX bodies, BiCyclic peptides, Kunitz domain derived antibody constructs, or any other antibody fragments so long as they exhibit the desired biological activity.
- the term encompasses other protein structures such as stapled peptides, antibody-like binding peptidomimetics, antibody-like binding scaffold proteins,
- an antigen-binding fragment is or comprises a polypeptide whose amino acid sequence includes the structural elements recognized by those skilled in the art as a complementarity
- an antigen-binding fragment is or comprises a polypeptide whose amino acid sequence includes an amino acid sequence that is substantially identical to one found in an anti-CD25 antibody as described herein (e.g., in an amino acid sequence of Antibody 1 , Antibody 2, Antibody 3 or Antibody 4).
- an antigen-binding fragment is or comprises a polypeptide whose amino acid sequence includes at least one heavy chain amino acid sequence comprising SEQ ID NO: 1 or 2 and/or at least one light chain amino acid sequence comprising SEQ ID NO: 3 or 4) that is either identical in sequence or contains a small number (e.g., 1 , 2, 3, or 4) more amino acid alterations (e.g., substitutions, additions, or deletions; in many cases, substitutions) relative to such a reference sequence, while maintaining binding to the target of the antibody from which the reference sequence was derived.
- an antigen-binding fragment is or comprises a polypeptide or complex thereof that includes all three CDRs (or, in some embodiments, sequences substantially identical thereto) from a heavy or light chain of a reference antibody (e.g., Antibody 1 , Antibody 2, Antibody 3 or Antibody 4).
- an antigen-binding fragment is or comprises a polypeptide or complex thereof that includes the heavy and/or light chain variable domains (or, in some embodiments, sequences substantially identical thereto) of a reference antibody (e.g. from Antibody 1 , Antibody 2, Antibody 3 or Antibody 4).
- the term“antigen-binding fragment” encompasses non- peptide and non-protein structures, such as nucleic acid aptamers, for example, RNA aptamers and DNA aptamers.
- An aptamer is an oligonucleotide (e.g., DNA, RNA, or an analog or derivative thereof) that binds to a particular target, such as a polypeptide.
- Aptamers are short synthetic single-stranded oligonucleotides that specifically bind to various molecular targets such as small molecules, proteins, nucleic acids, and even cells and tissues. These small nucleic acid molecules can form secondary and tertiary structures capable of specifically binding proteins or other cellular targets, and are essentially a chemical equivalent of antibodies. Aptamers are highly specific, relatively small in size, and non-immunogenic. Aptamers are generally selected from a biopanning method known as SELEX (Systematic Evolution of Ligands by Exponential enrichment) (See for example Ellington et al, 1990; Tuerk et al., 1990; Ni et al., 2011 ).
- SELEX Systematic Evolution of Ligands by Exponential enrichment
- An affimer is a small, highly stable protein engineered to display peptide loops which provide a high affinity binding surface for a specific target protein. It is a protein of low molecular weight, 12-14 kDa, derived from the cysteine protease inhibitor family of cystatins.
- Affimer proteins are composed of a scaffold, which is a stable protein based on the cystatin protein fold. They display two peptide loops and an N-terminal sequence that can be randomized to bind different target proteins with high affinity and specificity similar to antibodies. Stabilization of the peptide upon the protein scaffold constrains the possible conformations which the peptide may take, thus increasing the binding affinity and specificity compared to libraries of free peptides.
- biological sample typically refers to a sample obtained or derived from a biological source (e.g., a tissue or organism or cell culture) of interest, as described herein.
- a source of interest may be an organism, such as an animal or human.
- the biological sample may comprise biological tissue or fluid.
- cancer The terms “cancer”,“malignancy”, “neoplasm”, “tumor”,“tumour”, and “carcinoma”, are used interchangeably herein to refer to cells that exhibit relatively abnormal, uncontrolled, and/or autonomous growth, so that they exhibit an aberrant growth phenotype characterized by a significant loss of control of cell proliferation.
- cells of interest for detection or treatment in the present application include precancerous (e.g., benign), malignant, pre-metastatic, metastatic, and non-metastatic cells.
- precancerous e.g., benign
- malignant e.g., pre-metastatic, metastatic, and non-metastatic cells.
- the teachings of the present disclosure may be relevant to any and all cancers.
- teachings of the present disclosure are applied to one or more cancers such as, for example, hematopoietic cancers including leukemias, lymphomas (Hodgkins and non-Hodgkins), myelomas and myeloproliferative disorders; sarcomas, melanomas, adenomas, carcinomas of solid tissue, squamous cell carcinomas of the mouth, throat, larynx, and lung, liver cancer, genitourinary cancers such as prostate, cervical, bladder, uterine, and endometrial cancer and renal cell carcinomas, bone cancer, pancreatic cancer, skin cancer, cutaneous or intraocular melanoma, cancer of the endocrine system, cancer of the thyroid gland, cancer of the parathyroid gland, head and neck cancers, breast cancer, gastro-intestinal cancers and nervous system cancers, benign lesions such as papillomas, and the like.
- cancers such as, for example, hematopoietic cancers including leukemias,
- the antibodies of the invention can be used for the treatment of CD25+ expressing tumours.
- the treatment of cancer involving CD25 expressing tumours can include but is not limited to lymphomas, such as such as Hodgkin lymphomas, and lymphocytic leukemias, such as chronic lymphocytic leukemia (CLL).
- lymphomas such as such as Hodgkin lymphomas
- lymphocytic leukemias such as chronic lymphocytic leukemia (CLL).
- Combination therapy refers to those situations in which a subject is simultaneously exposed to two or more therapeutic regimens (e.g., two or more therapeutic agents). In some embodiments, two or more agents may be administered simultaneously. Alternatively, such agents may be
- Comparable refers to two or more agents, entities, situations, effects, sets of conditions, etc., that may not be identical to one another but that are sufficiently similar to permit comparison (e.g., by level and/or activity) there between so that conclusions may reasonably be drawn based on differences or similarities observed.
- Such comparable sets of conditions, effects, circumstances, individuals, or populations are characterized by a plurality of substantially identical features and one or a small number of varied features.
- composition or method described herein as “comprising” one or more named elements or steps is open-ended, meaning that the named elements or steps are essential, but other elements or steps may be added within the scope of the composition or method. It is also understood that any composition or method described as “comprising” (or which "comprises") one or more named elements or steps also describes the corresponding, more limited composition or method “consisting essentially of” (or which "consists essentially of") the same named elements or steps, meaning that the composition or method includes the named essential elements or steps and may also include additional elements or steps that do not materially affect the basic and novel characteristic(s) of the composition or method.
- references to“depleted” or“depleting” (with respect to the depletion of regulatory Tcells by an anti-CD25 antibody agent) it is meant that the number, ratio or percentage of Tregs is decreased relative to when an anti-CD25 antibody that does not inhibit the binding of interleukin 2 to CD25 is not administered.
- references to“depleted” or“depleting” it is meant that the number, ratio or percentage of Tregs is decreased relative to when an anti-CD25 antibody that does not inhibit the binding of interleukin 2 to CD25 is not administered.
- over about 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 99% of the tumour-infiltrating regulatory T cells are depleted.
- Dosage Form refers to a physically discrete unit of an active agent (e.g., a therapeutic or diagnostic agent) for administration to a subject.
- Each unit contains a predetermined quantity of active agent.
- such quantity is a unit dosage amount (or a whole fraction thereof) appropriate for administration in accordance with a dosing regimen that has been determined to correlate with a desired or beneficial outcome when administered to a relevant population (i.e., with a therapeutic dosing regimen).
- a dosing regimen i.e., with a therapeutic dosing regimen.
- the total amount of a therapeutic composition or agent administered to a particular subject is determined by one or more attending physicians and may involve administration of multiple dosage forms.
- Dosing regimen refers to a set of unit doses (typically more than one) that are administered individually to a subject, typically separated by periods of time.
- a given therapeutic agent has a recommended dosing regimen, which may involve one or more doses.
- a dosing regimen comprises a plurality of doses each of which are separated from one another by a time period of the same length.
- a dosing regimen comprises a plurality of doses and at least two different time periods separating individual doses.
- all doses within a dosing regimen are of the same unit dose amount.
- different doses within a dosing regimen are of different amounts.
- a dosing regimen comprises a first dose in a first dose amount, followed by one or more additional doses in a second dose amount different from the first dose amount.
- a dosing regimen may comprise a first dose in a first dose amount, followed by one or more additional doses in a second dose amount same as the first dose amount.
- a dosing regimen is correlated with a desired or beneficial outcome when administered across a relevant population (i.e., is a therapeutic dosing regimen).
- epitope refers to a portion of an antigen that is bound by an antibody or antigen-binding fragment.
- an epitope is conformational in that it is comprised of portions of an antigen that are not covalently contiguous in the antigen but that are near to one another in three-dimensional space when the antigen is in a relevant conformation.
- conformational epitopes are those comprised of amino acid residues that are not contiguous in CD25 extracellular domain
- linear epitopes are those comprised of amino acid residues that are contiguous in CD25 extracellular domain.
- epitopes utilized in accordance with the present invention are provided by means of reference to those bound by anti-CD25 Antibody Agents provided herein (e.g., by Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 and defined as aCD25ep-a and aCD25ep-b).
- Means for determining the exact sequence and/or particularly amino acid residues of the epitope for the antibody are known in the literature and in the Examples, including competition with peptides, from antigen sequences, binding to CD25 sequence from different species, truncated, and/or mutagenized (e.g. by alanine scanning or other site-directed mutagenesis), phage display-based screening, or (co-) crystallography techniques.
- Immune effector cell refers to an immune cell which is involved in the effector phase of an immune response.
- exemplary immune cells include a cell of a myeloid or lymphoid origin, e.g., lymphocytes (e.g., B cells and T cells including cytolytic T cells (CTLs)), killer cells, natural killer cells, macrophages, monocytes, eosinophils, neutrophils, polymorphonuclear cells, granulocytes, mast cells, and basophils.
- lymphocytes e.g., B cells and T cells including cytolytic T cells (CTLs)
- killer cells e.g., natural killer cells, macrophages, monocytes, eosinophils, neutrophils, polymorphonuclear cells, granulocytes, mast cells, and basophils.
- Immune effector cells involved in the effector phase of an immune response may express specific Fc receptors and carry out specific immune functions.
- An effector cell can induce antibody-dependent cell-mediated cytotoxicity (ADCC), e.g., a neutrophil capable of inducing ADCC.
- An effector cell can also induce antibody-dependent cell-mediated phagocytosis (ADCP), which consists in phagocytosis of a target antigen, target cell, or microorganism, e.g. macrophages capable of ADCP.
- ADCC antibody-dependent cell-mediated cytotoxicity
- ADCP antibody-dependent cell-mediated phagocytosis
- monocytes, macrophages, neutrophils, eosinophils, and lymphocytes which express FcyR are involved in specific killing of target cells and presenting antigens to other components of the immune system, or binding to cells that present antigens.
- the antibodies according to the present invention may be optimised for ability to induce ADCC and/or ADCP.
- Treg regulatory T cells
- Treg cells refer to a lineage of CD4+ T lymphocytes specialized in controlling autoimmunity, allergy and infection. Typically, they regulate the activities of T cell populations, but they can also influence certain innate immune system cell types. Tregs are usually identified by the expression of the biomarkers CD4, CD25 and Foxp3, and low expression of CD127. Naturally occurring Treg cells normally constitute about 5-10% of the peripheral CD4+ T lymphocytes. However, within a tumour microenvironment (i.e. tumour-infiltrating Treg cells), they can make up as much as 20-30% of the total CD4+ T lymphocyte population.
- Activated human Treg cells may directly kill target cells such as effector T cells and APCs through perforin- or granzyme B-dependent pathways; cytotoxic T-lymphocyte- associated antigen 4 (CTLA4+) Treg cells induce indoleamine 2,3-dioxygenase (IDO) expression by APCs, and these in turn suppress T-cell activation by reducing tryptophan; Treg cells, may release interleukin-10 (IL-10) and transforming growth factor (TGF3) in vivo, and thus directly inhibit T-cell activation and suppress APC function by inhibiting expression of MHC molecules, CD80, CD86 and IL-12. Treg cells can also suppress immunity by expressing high levels of CTLA4 which can bind to CD80 and CD86 on antigen presenting cells and prevent proper activation of effector T cells
- the term“patient” or“subject” refers to any organism to which a provided composition is or may be administered, e.g., for experimental, diagnostic, prophylactic, cosmetic, and/or therapeutic purposes. Typical patients include animals (e.g., mammals such as mice, rats, rabbits, non-human primates, and/or humans). In some embodiments, a patient is a human. In some embodiments, a patient is suffering from or susceptible to one or more disorders or conditions. A patient may display one or more symptoms of a disorder or condition, or may have been diagnosed with one or more disorders or conditions (such as cancer, or presence of one or more tumours). In some embodiments, the patient is receiving or has received certain therapy to diagnose and/or to treat such disease, disorder, or condition.
- animals e.g., mammals such as mice, rats, rabbits, non-human primates, and/or humans.
- a patient is a human.
- a patient is suffering from or susceptible to one or more disorders or conditions.
- a patient may display one or more symptoms
- composition refers to a composition in which an active agent is formulated together with one or more pharmaceutically acceptable carriers.
- active agent is present in unit dose amount appropriate for administration in a therapeutic regimen that shows a statistically significant probability of achieving a predetermined therapeutic effect when administered to a relevant population.
- a pharmaceutical compositions may be formulated for administration in solid or liquid form, including those adapted for the following: oral administration, for example, drenches (aqueous or non-aqueous solutions or suspensions), tablets, e.g., those targeted for buccal, sublingual, and systemic absorption, boluses, powders, granules, pastes for application to the tongue; parenteral administration, for example, by subcutaneous, intramuscular, intravenous, intratumoral, or epidural injection as a sterile solution or suspension, or sustained-release formulation; topical application, for example, as a cream, ointment, or a controlled-release patch or spray applied to skin, lungs, or oral cavity; intravaginally, intrarectally, sublingually, ocularly, transdermally, nasally, pulmonary, and to other mucosal surfaces.
- oral administration for example, drenches (aqueous or non-aqueous solutions or suspensions), tablets, e.g., those targeted for buccal,
- Solid Tumour refers to an abnormal mass of tissue that usually does not contain cysts or liquid areas. Solid tumours may be benign or malignant. Different types of solid tumours are named for the type of cells that form them. Examples of solid tumours are sarcomas (including cancers arising from transformed cells of mesenchymal origin in tissues such as cancellous bone, cartilage, fat, muscle, vascular, hematopoietic, or fibrous connective tissues), carcinomas (including tumours arising from epithelial cells), melanomas, lymphomas, mesothelioma,
- Cancers involving solid tumors include, without limitations, brain cancer, lung cancer, stomach cancer, duodenal cancer, esophagus cancer, breast cancer, colon and rectal cancer, renal cancer, bladder cancer, kidney cancer, pancreatic cancer, prostate cancer, ovarian cancer, melanoma, mouth cancer, sarcoma, eye cancer, thyroid cancer, urethral cancer, vaginal cancer, neck cancer, lymphoma, and the like.
- therapeutically effective amount means an amount (e.g., of an agent or of a pharmaceutical composition) that is sufficient, when administered to a population suffering from or susceptible to a disease and/or condition in accordance with a therapeutic dosing regimen, to treat such disease and/or condition.
- a therapeutically effective amount is one that reduces the incidence and/or severity of, stabilizes, and/or delays onset of, one or more symptoms of the disease, disorder, and/or condition.
- a“therapeutically effective amount” does not in fact require successful treatment be achieved in a particular subject.
- treatment refers to any administration of a substance (e.g., provided anti-CD25 Antibody Agent, e.g. as exemplified by Antibody 1 , Antibody 2, Antibody 3 or Antibody 4, or any other agent) that partially or completely alleviates, ameliorates, relives, inhibits, delays onset of, reduces severity of, and/or reduces incidence of one or more symptoms.
- a substance e.g., provided anti-CD25 Antibody Agent, e.g. as exemplified by Antibody 1 , Antibody 2, Antibody 3 or Antibody 4, or any other agent
- treatment may involve the direct administration of anti-CD25 Antibody Agent (for example, as an injectable, aqueous composition, optionally comprising a pharmaceutically acceptable carrier, excipient and/or adjuvant, for use for intravenous, intratumoral or peritumoral injection) or the administration using a regimen comprising obtaining cells from the subject (e.g.
- an anti-CD25 Antibody Agent such as Antibody 1 , Antibody 2, Antibody3 or Antibody 4, ex vivo, and administering such cells to the subject (with or without a selection on the basis of presence, or absence, of the expression of a marker).
- compositions comprising an anti- CD25 Antibody Agent as described herein (e.g. an anti-CD25 antibody or antigen-binding fragment or variant thereof, for example comprising amino acid sequences of Antibody 1 , Antibody 2, Antibody 3 or Antibody 4) for use in accordance with the present invention may be prepared for storage and/or delivery using any of a variety of techniques and/or technologies known and/or available to those skilled in the art.
- a provided anti-CD25 Antibody Agent is administered according to a dosing regimen approved by a regulatory authority such as the United States Food and Drug
- a provided anti-CD25 Antibody Agent is administered in combination with one or more other agents or therapies, which may themselves be administered according to a dosing regimen approved by a regulatory authority such as the United States Food and Drug Administration (FDA) and/or the European Medicines Agency (EMEA), e.g., for the relevant indication.
- a provided anti-CD25 Antibody Agent may permit reduced dosing (e.g., lower amount of active in one or more doses, smaller number of doses, and/or reduced frequency of doses) of an approved agent or therapy used in combination with the anti-CD25 Antibody Agent therapy.
- dosing and/or administration may be adapted to other drugs that also administered, the patient status, and/or the format of anti-CD25 Antibody Agent (e.g. modified as an immunoconjugate, a single domain antibody, or a bispecific antibody).
- anti-CD25 Antibody Agent e.g. modified as an immunoconjugate, a single domain antibody, or a bispecific antibody.
- therapeutic dosing regimens may be combined with or adjusted in light of detection methods that assess expression of one or more inducible markers or other criteria prior to and/or during therapy.
- dosing and administration according to the present invention utilizes active agent having a desired degree of purity combined with one or more physiologically acceptable carriers, excipients or stabilizers in any or variety of forms.
- physiologically acceptable carriers include, for example, liquid, semi-solid and solid dosage forms, such as liquid solutions (e.g., injectable and infusible solutions), dispersions or suspensions, tablets, pills, powders, liposomes and suppositories.
- a preferred form may depend on the intended mode of administration and/or therapeutic application, typically in the form of injectable or infusible solutions, such as compositions similar to those used for treating of human subjects with antibodies.
- ingredient(s) can be prepared with carriers that protect the agent(s) against rapid release and/or degradation, such as a controlled release
- each active agent is formulated, dosed, and administered in therapeutically effective amount using
- compositions and dosing regimens that are consistently with good medical practice and appropriate for the relevant agent(s) (e.g., for agents such as antibodies).
- Pharmaceutical compositions containing active agents can be administered by any appropriate method known in the art, including, without limitation, oral, mucosal, by- inhalation, topical, buccal, nasal, rectal, or parenteral (e.g. intravenous, infusion, intratumoral, intranodal, subcutaneous, intraperitoneal, intramuscular, intradermal, transdermal, or other kinds of administration involving physical breaching of a tissue of a subject and administration of the pharmaceutical composition through such breach).
- a dosing regimen for a particular active agent may involve intermittent or continuous (e.g., by perfusion or slow release system) administration, for example to achieve a particular desired pharmacokinetic profile or other pattern of exposure in one or more tissues or fluids of interest in the subject.
- different agents administered in combination may be administered via different routes of delivery and/or according to different schedules.
- one or more doses of a first active agent is administered substantially simultaneously with, and in some embodiments via a common route and/or as part of a single composition with, one or more other active agents.
- Factors to be considered when optimizing routes and/or dosing schedule for a given therapeutic regimen may include, for example, the particular cancer being treated (e.g., type, stage, location, etc.), the clinical condition of a subject (e.g., age, overall health, weight, etc.), the site of delivery of the agent, the nature of the agent (e.g. an antibody or other protein-based compound), the mode and/or route of administration of the agent, the presence or absence of combination therapy, and other factors known to medical practitioners.
- the particular cancer being treated e.g., type, stage, location, etc.
- the clinical condition of a subject e.g., age, overall health, weight, etc.
- the site of delivery of the agent e.g., the nature of the agent (e.g. an antibody or other protein-based compound), the mode and/or route of administration of the agent, the presence or absence of combination therapy, and other factors known to medical practitioners.
- the nature of the agent e.g. an antibody or other protein-based compound
- a specific route of delivery may impact dose amount and/or required dose amount may impact route of delivery.
- route of delivery may impact dose amount and/or required dose amount may impact route of delivery.
- focused delivery e.g., intratumoral delivery
- one or more features of a particular pharmaceutical composition and/or of a utilized dosing regimen may be modified over time (e.g., increasing or decreasing amount of active in any individual dose, increasing or decreasing time intervals between doses, etc.), for example in order to optimize a desired therapeutic effect or response (e.g., a therapeutic or biological response that is related to the functional features of an anti-CD25 Antibody Agent as described herein).
- a desired therapeutic effect or response e.g., a therapeutic or biological response that is related to the functional features of an anti-CD25 Antibody Agent as described herein.
- type, amount, and frequency of dosing of active agents in accordance with the present invention in governed by safety and efficacy requirements that apply when relevant agent(s) is/are administered to a mammal, preferably a human.
- an exemplary desirable therapeutic response may involve, but is not limited to, inhibition of and/or decreased tumour growth, tumour size, metastasis, one or more of the symptoms and side effects that are associated with the tumour, as well as increased apoptosis of cancer cells, therapeutically relevant decrease or increase of one or more cell marker or circulating markers and the like.
- Such criteria can be readily assessed by any of a variety of immunological, cytological, and other methods that are disclosed in the literature.
- the therapeutically effective amount of anti-CD25 Antibody Agents alone or in combination with a further agent, can be determined as being sufficient to enhance killing of cancer cells as described in the Examples.
- a therapeutically effective amount of an anti-CD25 Antibody Agent as active agent or composition comprising such agent can be readily determined using techniques available in the art including, for example, considering one or more factors such as the disease or condition being treated, the stage of the disease, the age and health and physical condition of the mammal being treated, the severity of the disease, the particular compound being administered, and the like.
- therapeutically effective amount is an effective dose (and/or a unit dose) of an active agent that may be at least about 0.01 mg/kg body weight, at least about 0.05 mg/kg body weight; at least about 0.1 mg/kg body weight, at least about 1 mg/kg body weight, at least about 5 mg/kg body weight, at least about 10 mg/kg body weight, or more (e.g. 0.01 , 0.1 , 0.3, 0.5, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, or 50 mg/kg body weight). It will be understood by one of skill in the art that in some active agent may be at least about 0.01 mg/kg body weight, at least about 0.05 mg/kg body weight; at least about 0.1 mg/kg body weight, at least about 1 mg/kg body weight, at least about 5 mg/kg body weight, at least about 10 mg/kg body weight, or more (e.g. 0.01 , 0.1 , 0.3, 0.5, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, or 50 mg/
- such guidelines may be adjusted for the molecular weight of the active agent.
- the dosage may also be varied for route of administration, the cycle of treatment, or consequently to dose escalation protocol that can be used to determine the maximum tolerated dose and dose limiting toxicity (if any) in connection to the administration of the isolated antibody or antigen-binding fragment or variant thereof comprising Antibody 1 , Antibody 2, Antibody 3 or Antibody 4 amino acid sequences at increasing doses.
- compositions typically should be sterile and stable under the conditions of manufacture and storage.
- the composition can be formulated as a solution, microemulsion, dispersion, liposome, or other ordered structure suitable to high drug concentration.
- Sterile injectable solutions can be prepared by incorporating the antibody in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, followed by filtered sterilization.
- dispersions are prepared by incorporating the active compound into a sterile vehicle that contains a basic dispersion medium and other required ingredients from those enumerated above.
- the preferred methods of preparation are vacuum drying and freeze drying that yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile filtered solution.
- the proper fluidity of a solution can be maintained, for example, by using a coating, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
- Prolonged absorption of injectable compositions can be brought about by including in the composition an agent that delays absorption, for example, monostearate salts and gelatin.
- each agent should desirably be sterile, as can be accomplished by filtration through sterile filtration membranes, and then packaged, or sold in a form suitable for bolus administration or for continuous administration.
- injectable formulations may be prepared, packaged, or sold in unit dosage form, such as in ampules or in multi dose containers containing a preservative.
- Formulations for parenteral administration include, but are not limited to, suspensions, solutions, emulsions in oily or aqueous vehicles, pastes, and implantable sustained-release or biodegradable formulations as discussed herein.
- Sterile injectable formulations may be prepared using a non-toxic parenterally acceptable diluent or solvent, such as water or 1 ,3 butanediol.
- compositions for sustained release or implantation may comprise pharmaceutically acceptable polymeric or hydrophobic materials such as an emulsion, an ion exchange resin, a sparingly soluble polymer or salt.
- Each pharmaceutical composition for use in accordance with the present invention may include pharmaceutically acceptable dispersing agents, wetting agents, suspending agents, isotonic agents, coatings, antibacterial and antifungal agents, carriers, excipients, salts, or stabilizers are non-toxic to the subjects at the dosages and concentrations employed.
- additional pharmaceutically acceptable compounds includes buffers such as phosphate, citrate, and other organic acids;
- antioxidants including ascorbic acid and methionine; salts containing pharmacologically acceptable anions (such as acetate, benzoate, bicarbonate, bisulfate, isothionate, lactate, lactobionate, laurate, malate, maleate, salicylate, stearate, subacetate, succinate, tannate, tartrate, teoclate, tosylate, thiethiodode, and valerate salts); preservatives (such as octadecyidimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; sodium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3- pentanol; and m-cresol); low molecular weight (
- amino acids such as glycine, glutamine, asparagine, glutamic acid, histidine, arginine, or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugars such as sucrose, mannitol, trehalose or sorbitol; salt-forming counter-ions such as sodium; metal complexes (e.g., Zn-protein complexes); and/or non-ionic surfactants such as TWEENTM, PLURONICSTM, or polyethylene glycol (PEG).
- administration of one agent is specifically timed relative to administration of another agent.
- desired relative dosing regimens for agents administered in combination may be assessed or determined empirically, for example using ex vivo, in vivo and/or in vitro models; in some
- such assessment or empirical determination is made in vivo, in a particular patient or patient population (e.g., so that a correlation is made).
- one or more active agents utilized in practice of the present invention is administered according to an intermittent dosing regimen comprising at least two cycles. Where two or more agents are administered in combination, and each by such an intermittent, cycling, regimen, individual doses of different agents may be interdigitated with one another.
- one or more doses of the second agent is administered a period of time after a dose of an anti-CD25 Antibody Agent as described herein. In some embodiments, each dose of the second agent is administered a period of time after a dose of anti-CD25 Antibody Agent as described herein. In some embodiments, one or more doses of the second agent is administered a period of time before a dose of an anti-CD25 Antibody Agent.
- an anti-CD25 Antibody Agent as described herein can be also administered in regimens that involve not only subsequent administration by the same route but also by alternating administration routes such as by sub-cutaneous (or intramuscular) administration and intra-tumoral administration, within one or more cycles of treatments over one, two, four or more weeks, repeating such cycle with the same regimen (or by extending the interval between administrations), depending of patient responses.
- the precise regimen followed e.g., number of doses, spacing of doses (e.g., relative to each other or to another event such as administration of another therapy), amount of doses, etc. may be different for one or more cycles as compared with one or more other cycles.
- an anti-CD25 Antibody Agent as described herein can be identified, characterized, and/or validated, for example, taking into account one or more criteria that are measured in the patients using biopsies, blood samples, and/or other clinical criteria.
- therapeutic efficacy of an anti-CD25 Antibody Agent as described herein can be determined in methods wherein one or more different general criteria are evaluated: decrease of regulatory T cells in circulation, tumours and/or in lymphoid organs, direct cytotoxicity on cancer cells (apoptosis and necrosis of cancer cells), increase of tumour infiltrating, immune cells (such as CD4-positive and/or CD8-positive tumour infiltrating T cells), increase in immune cells that circulates in blood (total populations or specific sub-populations of lymphocytes, NK cells, monocytes, dendritic cells, macrophages, B cells, etc.), and/or presenting some differential expression pre- versus post-treatment only in either responding or non-responding patients (as determined by RNA sequencing, mass flow cytometry, and/or other mass sequencing approach).
- such identification, characterization, and/or validation may involve the follow-up at molecular level by screening the mRNA and/or protein expression of one or more specific proteins or sets of proteins.
- one or more such techniques may allow identification or relevant information for evaluating the response to an anti-CD25 Antibody Agent as described herein, for example that may be is related to tissue distribution and/or markers for specific cell populations within (or nearby) the tumour and/or circulating in blood.
- Such approaches and immune-biological data may allow determination not only of one or more efficacy and/or safety parameters or characteristics, but in some
- an anti-CD25 Antibody Agent as described herein is used in a method of treating a patient suffering from a disease (such as cancer) or preventing a disease (such as cancer) after determining the combined presence (and/or absence) of expression at RNA and/or protein level for one or more genes in cells or tissues of the patient (such as a tumour, a blood sample, or a blood fraction), post- or pre-treatment with such a formulation.
- Such methods may allow therefore defining one or more biomarkers, or a more complex gene expression signature (or cell population distribution) that is associated to the therapeutically effective amount of a desirable anti-CD25 Antibody Agent, the therapeutically relevant biomarker(s) that predicts that a subject may have an anti-tumour or anti-infective response after the treatment with an anti-CD25 Antibody Agent as described herein, or the therapeutically relevant biomarker(s) that predicts that a subject may respond to the treatment with a compound after the treatment with an anti- CD25 Antibody Agent.
- dosing and administration for a particular anti-CD25 Antibody Agent as disclosed herein can be preliminarily established and/or later evaluated in view of CD25 expression in human cancers and/or other human tissues, for example by gathering data about CD25 distribution in stromal and/or immune subsets in various cancers, tissues and/or patients.
- Such data can be generated by using common technologies (such as flow cytometry, mass cytometry, immunohistochemistry or mRNA expression libraries) across common cancer types and/or tissues (central nervous system, Esophagus, Stomach, Liver, Colon, Rectum, Lung, Bladder, Heart, Kidney, Thyroid, Pancreas, Uterus, Skin, Breast, Ovary, Prostate and testis) for identifying relationship between CD25 expression in various immune and non-immune
- CD25 expression can be confined (or not) to immune subsets in tumour tissue (such as in NK cells and other effector or regulatory immune cells), and correlations between CD25 expression and immune checkpoint inhibitors can be determined if being positive, thus suggesting appropriate uses of anti-CD25 Antibody Agents in combinations with compounds targeting such immune checkpoint inhibitor, for example a PD-1 antagonist, such as an anti-PD-1 antibody or an anti-PD-L1 antibody.
- a PD-1 antagonist such as an anti-PD-1 antibody or an anti-PD-L1 antibody.
- an anti- CD25 Antibody Agent as described herein is provided in a separate article of
- an article of manufacture containing an anti-CD25 Antibody Agent is provided in or with a container with a label.
- suitable containers may include, for example, bottles, vials, syringes, and test tubes.
- a container may be formed from any or a variety of materials such as glass or plastic.
- a container holds a composition that is effective for treating a particular disease, disorder, or condition, or stage or type thereof.
- a container may have a sterile access port (for example the container may be an intravenous solution bag or a vial having a stopper pierceable by a hypodermic injection needle).
- a composition comprising an anti- CD25 Antibody Agent as described herein is packaged in clear glass vials with a rubber stopper and an aluminium seal.
- the label on, or associated with, the container indicates that the composition is used for treating the condition of choice.
- an article of manufacture may further comprise a separate container comprising a pharmaceutically acceptable buffer, such as phosphate-buffered saline, Ringer's solution and dextrose solution and/or may further include other materials desirable from a commercial and user standpoint, including other buffers, diluents, filters, needles, syringes, and package inserts with instructions for use.
- an article of manufacture may allow providing each or the agent in an intravenous formulation as a sterile aqueous solution containing a total of 2 mg, 5 mg, 10 mg, 20 mg, 50 mg, or more that are formulated, with appropriate diluents and buffers, at a final concentration of 0.1 mg/ml, 1 mg/ml, 10 mg/ml, or at a higher concentration.
- an anti-CD25 Antibody Agent as described herein can be provided within the kits-of-parts in the form of lyophilized is to be reconstituted with any appropriate aqueous solution that provided or not with the kits, or other types of dosage unit using any compatible pharmaceutical carrier.
- One or more unit dosage forms of an anti-CD25 Antibody Agent may be provided in a pack or dispenser device.
- a pack or device may, for example, comprise metal or plastic foil, such as a blister pack.
- it may further comprise buffers, diluents, filters, needles, syringes, and package inserts with instructions for use in the treatment of cancer.
- instructions that are associated with an article of manufacture or the kits as described herein may be in the form of a label, a leaflet, a publication, a recording, a diagram, or any other means that can be used to inform about the correct use and/or monitoring of the possible effects of the agents, formulations, and other materials in the article of manufacture and/or in the kit. Instructions may be provided together with the article of manufacture and/or in the kit.
- CDRs complementarity determining regions
- FRs framework regions
- the antibodies were synthesised and cloned as human lgG1.
- the antibodies were expressed in mammalian cells (HEK293) HEK293.
- Cells were transiently transfected with heavy and light chain expression vectors and cultured for a further 6-14 days. An appropriate volume of cells were transfected to obtain approximately 1 mg of antibody. Cultures were harvested and a one-step purification performed using affinity
- the antibodies can also be synthesised and cloned by the following method. Synthesis of codon optimized VH and VL coding sequences for the antibodies can be performed by Genewiz. cDNAs of variable regions can be cloned into the antibody expression vector (lcosagen, EST) containing human lgG1 heavy chain and kappa light chain constant regions (for example P01857 and P01834 respectively). Full length heavy and light chain cDNAs are verified by sequencing in final vectors and then recloned for expressing them using the QMCF Technology (lcosagen) a stable episomal expression system that uses CHO-based cells (CHOEBNALT85) and appropriate vectors for production of recombinant proteins, antibodies. CHOEBNALT85 cells are transfected with 1 pg of the expression plasmids for antibody production. 48 h after the transfection
- hlgG1 antibodies are purified by MabSelect SuRe affinity chromatography followed by Superdex 200 gel filtration into either PBS or PBS 100mM L-Arg.
- the peptide arrays were incubated with primary antibody solution (overnight at 4°C). After washing, the peptide arrays were incubated with a 1/1000 dilution of an appropriate antibody peroxidase conjugate (2010-05; Southern Biotech) for one hour at 25°C. After washing, the peroxidase substrate 2,2’-azino-di- 3-ethylbenzthiazoline sulfonate (ABTS) and 20 mI/ml of 3 percent H2O2 were added. After one hour, the color development was measured. The colour development was quantified with a charge coupled device (CCD) - camera and an image processing system.
- CCD charge coupled device
- the values obtained from the CCD camera range from 0 to 3000 mAU, similar to a standard 96-well plate ELISA-reader.
- a separate set of positive and negative control peptides was synthesized in parallel and screened with irrelevant, control antibodies.
- Binding to CD25 expressing Karpas 299 cells was examined by staining Karpas299 cells with test articles (anti-CD25 primary antibodies) starting at a concentration of 20mg/ml antibodies followed by semi-log dilution series (7-point) for 30 minutes on ice. This was followed by staining with a secondary antibody (Alexa Fluor 647-AffiniPure F(ab’)2 Fragment Rabbit Anti-Human IgG Fey fragment - (Jackson ImmunoResearch)) at a concentration of 1 pg/ml for 30 minutes on ice. All samples were stained in duplicates. Live cells were gated using FSC vs SSC parameters by flow cytometry during sample acquisition. Mean fluorescence intensity (MFI) of stained cells were plotted on an XY chart, graphing MFI against the log of the concentration, and the data fit to a non-linear regression curve from which the EC50 is calculated. Results are shown in Figure 3.
- MFI Mean fluorescence intensity
- the affinity for the anti human CD25 antibodies was determined by measuring their K D by SPR in a Biacore 2000 using a CM-5 Sensor chip with an ambient experiment
- Antibody competitions were performed on a Forte Bio Octet Red96 system (Pall Forte Bio Corp., USA) using a standard sequential binding assay. 26.8 nM recombinant human CD25his tagged was loaded onto Ni-NTA Biosensors for 200s. After base line step on kinetic buffer sensors were exposed to 66.6 nM of first antibody for 600s followed by a second anti-CD25 antibody (also at 66.6nM for 600s). Data was processed using Forte Bio Data Analysis Software 9.0. Additional binding by a second antibody indicates an unoccupied epitope (no competition for the epitope), while no binding indicates epitope blocking (competition for the epitope). The results are shown in in Figure 5.
- IL-2-blocking was characterised using a STAT5 phosphorylation assay, in which IL-2 signalling was examined.
- Previously frozen PBMC (Stemcell Technologies) were cultured in 96-U-bottom well plates in the presence of 10pg/ml anti-CD25 antibodies for 30 minutes before adding IL-2 (Peprotech) at 10U/ml for 10 minutes in RPMI 1640 (Life Technologies) containing 10% FBS (Sigma), 2mM L-Glutamine (Life Technologies) and 10,000 U/ml Pen-Strep (Sigma).
- IL-2 induced STAT5 phosphorylation was stopped when the cells were fixed and permeabilized with the eBioscienceTM Foxp3 / Transcription Factor Staining Buffer Set (Invitrogen) and treated with the BD Phosflow Perm Buffer III (BD Biosciences).
- CD3 + T cells were defined using a CD3 PerCP-Cy5.5-A versus FCS-A plot and a gate was drawn on a histogram showing count versus STAT5 Alexa Fluor 647-A to determine the population of STAT5 + CD3 + T cells.
- Previously frozen primary human Pan T cells (Stemcell Technologies) are labelled with eFluor450 cell proliferation dye (Invitrogen) according to manufacturer’s recommendation, and added to 96-U-bottom well plates at 1x10 5 cells/well in RPMI 1640 (Life Technologies) containing 10% FBS (Sigma), 2mM L-Glutamine (Life Technologies) and 10,000 U/ml Pen-Strep (Sigma).
- the cells are then treated with 10pg/ml anti-CD25 antibodies or control antibodies followed by Human T-Activator CD3/CD28 (20:1 cell to bead ratio; Gibco) and incubated for 72hrs in a 37°C, 5% CO2 humidified incubator.
- T cell activation cells are stained with the eBioscience Fixable Viability Dye efluor780
- Doublets are excluded using FCS-H versus FCS-A, and lymphocytes defined using SSC- A versus FCS-A parameters.
- CD4 + and CD8 + T cell subsets gated from the live CD3 + lymphocytes are assessed using a GrB-PE-A versus proliferation eFluor450-A plot.
- Results are presented as percentage of proliferating GrB positive cells from the whole CD4 + T cell population. Graphs and statistical analysis is performed using GraphPad Prism v7. (results not shown)
- ADCC assays Antibody-dependent cell-mediated cytotoxicity assays (ADCC assays) were performed for the characterization of anti-human CD25 antibodies using CD25-expressing SR786 cells, herein called target (T) cells, incubated for 20 minutes at 37C with different concentrations of anti-human CD25 antibodies in a low-lgG FBS-supplemented medium (4% FBS in RPMI).
- ADCC effector (E) cells are then added to the cell-mAbs mixture at an E:T ratio of 1 :1.
- the effector cells are Jurkat cells stably transfected with a luciferase reporter system and over-expressing CD16/FcgammaRIIIA (Promega).
- luciferase activity is measured by mean of luminescence release from the hydrolysis of a specific luciferase substrate, following manufacturer instruction (Promega Bio-Glow protocol).
- Graphs of the raw data are produced using Graphpad Prism v7 to generate dose response curves.
- the Relative Luminescences Units (RLU) are plotted on a XY chart against the log of the antibody concentration, and the data fir to a non-linear regression curve from which the EC50 is calculated.
- ADCP antibody-dependent cell-mediated phagocytosis
- Monocytes were cultured for 5 days in the presence of 50ng/ml M-CSF in RPMI 1640 (Life Technologies) containing 10% FBS (Sigma), 2mM L- Glutamine (Life Technologies) and 10,000 U/ml Pen-Strep (Sigma), fresh media containing M-CSF is added after 3 days.
- Regulatory T cells were isolated using the Human Treg Cell Differentiation Kit (R&D Systems). These cells were incubated in a 37°C, 5% CO2 humidified incubator for 5 days and labelled with eFluor450-dye (Invitrogen), as per manufacturer recommendations.
- Tregs are cocultured for 4 hours at a 10 to 1 effector to target ratio in the presence of anti-CD25 antibodies or controls, as describe thereafter.
- Target cells (Treg) were added at 1x10 4 cells/well while the effector cells (macrophages) were added at 1x10 5 cells/well, for an effector to target ratio of 10 to 1.
- the anti-CD25 antibodies were then added at a top concentration of 1 pg/ml followed by a log series (7 points) in duplicates. Cells and antibodies were incubated for 4 hours at 37°C 5% CO2.
- the antibodies, identified in Example 1 was further evaluated with respect to its ability to not interfere with IL-2 signalling and its capacity to kill of CD25 expressing target cells.
- the STAT5 assay showed that Antibodies did not block IL-2 signalling regardless of IL-2 concentrations tested while IL-2 signalling was completely blocked by the reference antibody Daclizumab ( Figure 6).
- the competition assay showed that Antibody 2 does do not compete with Daclizumab or Basiliximab ( Figure 5).
- Daclizumab which has been shown to block the interaction of CD25 with IL-2 via the so-called“Tac” epitope (Queen C et al, 1989 and Bielekova B, 2013), and Basilizimab, bind to different epitopes than Antibody 2 ( Figure 5). This can explain why Daclizumab blocks IL-2 signalling and Antibody 2 does not block the IL-2 signalling in the STAT5 phosphorylation assay ( Figure 6). Finally, the antibodies induce ADCC against CD25 expressing cancer cells ( Figure 7) and the killing of human macrophages via ADPC ( Figure 8) when compared to the lgG1 isotype or an Fc silent CD25 targeting antibody.
- Antibodies have been characterized and demonstrate ability to kill CD25 positive cells (Tregs or cancer cell lines) and do not interfere with IL-2 signalling and consequently do not inhibit T effector responses.
- the Antibody 1 , Antibody 2, Antibody 3 and Antibody 4 are thus Treg depleting antibodies which could be applied for the treatment of cancer, as monotherapy or in combination.
- each antibody mouse lgG2a isotype, IL-2 neutralizing antibody, PC61 mlgG1 , a anti-mouse CD25 blocking IL-2 signalling of mouse lgG1 isotype, and 7D4 mlgG2a, an anti-
- the anti-CD25 depleting non-IL-2 blocking antibody 7D4 mlgG2a induced tumour rejection in treated mice, while the other antibodies showed no effect as monotherapy when compared to the isotype control mouse lgG2a.
- This demonstrates that the non-IL-2 blocking feature of 7D4 mlgG2a is key for therapeutic activity. It also suggests that the therapeutic activity of this antibody relies on anti-tumour immune response mediated by T effector cells, which are dependent on IL-2 signalling for optimal activity.
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Abstract
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201862642248P | 2018-03-13 | 2018-03-13 | |
US201862642230P | 2018-03-13 | 2018-03-13 | |
US201862642218P | 2018-03-13 | 2018-03-13 | |
US201862642243P | 2018-03-13 | 2018-03-13 | |
US201862642232P | 2018-03-13 | 2018-03-13 | |
GBGB1804028.7A GB201804028D0 (en) | 2018-03-13 | 2018-03-13 | Anti-CD25 antibody agents |
GBGB1804029.5A GB201804029D0 (en) | 2018-03-13 | 2018-03-13 | Anti-CD25 antibody agents |
GBGB1804027.9A GB201804027D0 (en) | 2018-03-13 | 2018-03-13 | Anti-CD25 antibody agents |
PCT/EP2018/056312 WO2018167104A1 (fr) | 2017-03-17 | 2018-03-13 | Anti-cd25 à optimisation fc pour épuisement de cellules spécifiques tumorales |
PCT/EP2019/056258 WO2019175224A1 (fr) | 2018-03-13 | 2019-03-13 | Anticorps anti-cd25 pour la déplétion de cellules spécifiques d'une tumeur |
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